Zechmeister, Mathias

[["dc.bibliographiccitation.firstpage","A68"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","625"],["dc.contributor.author","Schweitzer, A."],["dc.contributor.author","Passegger, V. M."],["dc.contributor.author","Cifuentes, C."],["dc.contributor.author","Béjar, V. J. S."],["dc.contributor.author","Cortés-Contreras, M."],["dc.contributor.author","Caballero, J. A."],["dc.contributor.author","del Burgo, C."],["dc.contributor.author","Czesla, S."],["dc.contributor.author","Kürster, M."],["dc.contributor.author","Montes, D."],["dc.contributor.author","Zapatero Osorio, M. R."],["dc.contributor.author","Ribas, I."],["dc.contributor.author","Reiners, A."],["dc.contributor.author","Quirrenbach, A."],["dc.contributor.author","Amado, P. J."],["dc.contributor.author","Aceituno, J."],["dc.contributor.author","Anglada-Escudé, G."],["dc.contributor.author","Bauer, F. F."],["dc.contributor.author","Dreizler, S."],["dc.contributor.author","Jeffers, S. V."],["dc.contributor.author","Guenther, E. W."],["dc.contributor.author","Henning, T."],["dc.contributor.author","Kaminski, A."],["dc.contributor.author","Lafarga, M."],["dc.contributor.author","Marfil, E."],["dc.contributor.author","Morales, J. C."],["dc.contributor.author","Schmitt, J. H. M. M."],["dc.contributor.author","Seifert, W."],["dc.contributor.author","Solano, E."],["dc.contributor.author","Tabernero, H. M."],["dc.contributor.author","Zechmeister, M."],["dc.date.accessioned","2020-12-10T18:11:47Z"],["dc.date.available","2020-12-10T18:11:47Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1051/0004-6361/201834965"],["dc.identifier.eissn","1432-0746"],["dc.identifier.issn","0004-6361"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/74142"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","The CARMENES search for exoplanets around M dwarfs"],["dc.title.alternative","Different roads to radii and masses of the target stars"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A20"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","648"],["dc.contributor.author","Toledo-Padrón, B."],["dc.contributor.author","Suárez Mascareño, A."],["dc.contributor.author","González Hernández, J. I."],["dc.contributor.author","Rebolo, R."],["dc.contributor.author","Pinamonti, M."],["dc.contributor.author","Perger, M."],["dc.contributor.author","Scandariato, G."],["dc.contributor.author","Damasso, M."],["dc.contributor.author","Sozzetti, A."],["dc.contributor.author","Zechmeister, M."],["dc.date.accessioned","2021-06-01T09:41:47Z"],["dc.date.available","2021-06-01T09:41:47Z"],["dc.date.issued","2021"],["dc.description.abstract","Context. M-dwarfs have proven to be ideal targets for planetary radial velocity (RV) searches due to their higher planet-star mass contrast, which favors the detection of low-mass planets. The abundance of super-Earth and Earth-like planets detected around this type of star motivates further such research on hosts without reported planetary companions. Aims. The HADES and CARMENES programs are aimed at carrying out extensive searches of exoplanetary systems around M-type stars in the northern hemisphere, allowing us to address, in a statistical sense, the properties of the planets orbiting these objects. In this work, we perform a spectroscopic and photometric study of one of the program stars (GJ 740), which exhibits a short-period RV signal that is compatible with a planetary companion. Methods. We carried out a spectroscopic analysis based on 129 HARPS-N spectra taken over a time span of 6 yr combined with 57 HARPS spectra taken over 4 yr, as well as 32 CARMENES spectra taken during more than 1 yr, resulting in a dataset with a time coverage of 10 yr. We also relied on 459 measurements from the public ASAS survey with a time-coverage of 8 yr, along with 5 yr of photometric magnitudes from the EXORAP project taken in the V , B , R , and I filters to carry out a photometric study. Both analyses were made using Markov chain Monte Carlo simulations and Gaussian process regression to model the activity of the star. Results. We present the discovery of a short-period super-Earth with an orbital period of 2.37756 −0.00011 +0.00013 d and a minimum mass of 2.96 −0.48 +0.50 M ⊕ . We offer an update to the previously reported characterization of the magnetic cycle and rotation period of the star, obtaining values of P rot = 35.563 ± 0.071 d and P cycle = 2800 ± 150 d. Furthermore, the RV time series exhibits a possibly periodic long-term signal, which might be related to a Saturn-mass planet of ~100 M ⊕ ."],["dc.identifier.doi","10.1051/0004-6361/202040099"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/85038"],["dc.notes.intern","DOI-Import GROB-425"],["dc.relation.eissn","1432-0746"],["dc.relation.issn","0004-6361"],["dc.title","A super-Earth on a close-in orbit around the M1V star GJ 740"],["dc.title.alternative","A HADES and CARMENES collaboration"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A22"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","645"],["dc.contributor.author","Yan, F."],["dc.contributor.author","Wyttenbach, A."],["dc.contributor.author","Casasayas-Barris, N."],["dc.contributor.author","Reiners, A."],["dc.contributor.author","Pallé, E."],["dc.contributor.author","Henning, Th."],["dc.contributor.author","Mollière, P."],["dc.contributor.author","Czesla, S."],["dc.contributor.author","Nortmann, L."],["dc.contributor.author","Molaverdikhani, K."],["dc.contributor.author","Chen, G."],["dc.contributor.author","Snellen, I. A. G."],["dc.contributor.author","Zechmeister, M."],["dc.contributor.author","Huang, C."],["dc.contributor.author","Ribas, I."],["dc.contributor.author","Quirrenbach, A."],["dc.contributor.author","Caballero, J. A."],["dc.contributor.author","Amado, P. J."],["dc.contributor.author","Cont, D."],["dc.contributor.author","Khalafinejad, S."],["dc.contributor.author","Khaimova, J."],["dc.contributor.author","López-Puertas, M."],["dc.contributor.author","Montes, D."],["dc.contributor.author","Nagel, E."],["dc.contributor.author","Oshagh, M."],["dc.contributor.author","Pedraz, S."],["dc.contributor.author","Stangret, M."],["dc.date.accessioned","2021-04-14T08:30:14Z"],["dc.date.available","2021-04-14T08:30:14Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1051/0004-6361/202039302"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/83161"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1432-0746"],["dc.relation.issn","0004-6361"],["dc.title","Detection of the hydrogen Balmer lines in the ultra-hot Jupiter WASP-33b"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

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[["dc.bibliographiccitation.firstpage","A50"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","640"],["dc.contributor.author","Bauer, F. F."],["dc.contributor.author","Zechmeister, M."],["dc.contributor.author","Kaminski, A."],["dc.contributor.author","Rodríguez López, C."],["dc.contributor.author","Caballero, J. A."],["dc.contributor.author","Azzaro, M."],["dc.contributor.author","Stahl, O."],["dc.contributor.author","Kossakowski, D."],["dc.contributor.author","Quirrenbach, A."],["dc.contributor.author","Becerril Jarque, S."],["dc.contributor.author","Rodríguez, E."],["dc.contributor.author","Amado, P. J."],["dc.contributor.author","Seifert, W."],["dc.contributor.author","Reiners, A."],["dc.contributor.author","Schäfer, S."],["dc.contributor.author","Ribas, I."],["dc.contributor.author","Béjar, V. J. S."],["dc.contributor.author","Cortés-Contreras, M."],["dc.contributor.author","Dreizler, S."],["dc.contributor.author","Hatzes, A."],["dc.contributor.author","Henning, T."],["dc.contributor.author","Jeffers, S. V."],["dc.contributor.author","Kürster, M."],["dc.contributor.author","Lafarga, M."],["dc.contributor.author","Montes, D."],["dc.contributor.author","Morales, J. C."],["dc.contributor.author","Schmitt, J. H. M. M."],["dc.contributor.author","Schweitzer, A."],["dc.contributor.author","Solano, E."],["dc.date.accessioned","2021-04-14T08:24:23Z"],["dc.date.available","2021-04-14T08:24:23Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1051/0004-6361/202038031"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/81267"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1432-0746"],["dc.relation.issn","0004-6361"],["dc.title","The CARMENES search for exoplanets around M dwarfs"],["dc.title.alternative","Measuring precise radial velocities in the near infrared: The example of the super-Earth CD Cet b"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

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[["dc.bibliographiccitation.firstpage","A41"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","623"],["dc.contributor.author","Palle, E."],["dc.contributor.author","Nowak, G."],["dc.contributor.author","Luque, R."],["dc.contributor.author","Hidalgo, D."],["dc.contributor.author","Barragán, O."],["dc.contributor.author","Prieto-Arranz, J."],["dc.contributor.author","Hirano, T."],["dc.contributor.author","Fridlund, M."],["dc.contributor.author","Gandolfi, D."],["dc.contributor.author","Livingston, J."],["dc.contributor.author","Dai, F."],["dc.contributor.author","Morales, J. C."],["dc.contributor.author","Lafarga, M."],["dc.contributor.author","Albrecht, S."],["dc.contributor.author","Alonso, R."],["dc.contributor.author","Amado, P. J."],["dc.contributor.author","Caballero, J. A."],["dc.contributor.author","Cabrera, J."],["dc.contributor.author","Cochran, W. D."],["dc.contributor.author","Csizmadia, Sz."],["dc.contributor.author","Deeg, H."],["dc.contributor.author","Eigmüller, Ph."],["dc.contributor.author","Endl, M."],["dc.contributor.author","Erikson, A."],["dc.contributor.author","Fukui, A."],["dc.contributor.author","Guenther, E. W."],["dc.contributor.author","Grziwa, S."],["dc.contributor.author","Hatzes, A. P."],["dc.contributor.author","Korth, J."],["dc.contributor.author","Kürster, M."],["dc.contributor.author","Kuzuhara, M."],["dc.contributor.author","Rodríguez, P. Montañes"],["dc.contributor.author","Murgas, F."],["dc.contributor.author","Narita, N."],["dc.contributor.author","Nespral, D."],["dc.contributor.author","Pätzold, M."],["dc.contributor.author","Persson, C. M."],["dc.contributor.author","Quirrenbach, A."],["dc.contributor.author","Rauer, H."],["dc.contributor.author","Redfield, S."],["dc.contributor.author","Reiners, A."],["dc.contributor.author","Ribas, I."],["dc.contributor.author","Smith, A. M. S."],["dc.contributor.author","Van Eylen, V."],["dc.contributor.author","Winn, J. N."],["dc.contributor.author","Zechmeister, M."],["dc.date.accessioned","2020-12-10T18:11:44Z"],["dc.date.available","2020-12-10T18:11:44Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1051/0004-6361/201834001"],["dc.identifier.eissn","1432-0746"],["dc.identifier.issn","0004-6361"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/74123"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Detection and Doppler monitoring of K2-285 (EPIC 246471491), a system of four transiting planets smaller than Neptune"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A236"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","642"],["dc.contributor.author","Kemmer, J."],["dc.contributor.author","Stock, S."],["dc.contributor.author","Kossakowski, D."],["dc.contributor.author","Kaminski, A."],["dc.contributor.author","Molaverdikhani, K."],["dc.contributor.author","Schlecker, M."],["dc.contributor.author","Caballero, J. A."],["dc.contributor.author","Amado, P. J."],["dc.contributor.author","Astudillo-Defru, N."],["dc.contributor.author","Zechmeister, M."],["dc.date.accessioned","2021-04-14T09:58:48Z"],["dc.date.available","2021-04-14T09:58:48Z"],["dc.date.issued","2020"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/84192"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1432-0746"],["dc.relation.issn","0004-6361"],["dc.title","Discovery of a hot, transiting, Earth-sized planet and a second temperate, non-transiting planet around the M4 dwarf GJ 3473 (TOI-488)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A97"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","620"],["dc.contributor.author","Salz, M."],["dc.contributor.author","Czesla, S."],["dc.contributor.author","Schneider, P. C."],["dc.contributor.author","Nagel, E."],["dc.contributor.author","Schmitt, J. H. M. M."],["dc.contributor.author","Nortmann, L."],["dc.contributor.author","Alonso-Floriano, F. J."],["dc.contributor.author","López-Puertas, M."],["dc.contributor.author","Lampón, M."],["dc.contributor.author","Bauer, F. F."],["dc.contributor.author","Snellen, I. A. G."],["dc.contributor.author","Pallé, E."],["dc.contributor.author","Caballero, J. A."],["dc.contributor.author","Yan, F."],["dc.contributor.author","Chen, G."],["dc.contributor.author","Sanz-Forcada, J."],["dc.contributor.author","Amado, P. J."],["dc.contributor.author","Quirrenbach, A."],["dc.contributor.author","Ribas, I."],["dc.contributor.author","Reiners, A."],["dc.contributor.author","Béjar, V. J. S."],["dc.contributor.author","Casasayas-Barris, N."],["dc.contributor.author","Cortés-Contreras, M."],["dc.contributor.author","Dreizler, S."],["dc.contributor.author","Guenther, E. W."],["dc.contributor.author","Henning, T."],["dc.contributor.author","Jeffers, S. V."],["dc.contributor.author","Kaminski, A."],["dc.contributor.author","Kürster, M."],["dc.contributor.author","Lafarga, M."],["dc.contributor.author","Lara, L. M."],["dc.contributor.author","Molaverdikhani, K."],["dc.contributor.author","Montes, D."],["dc.contributor.author","Morales, J. C."],["dc.contributor.author","Sánchez-López, A."],["dc.contributor.author","Seifert, W."],["dc.contributor.author","Zapatero Osorio, M. R."],["dc.contributor.author","Zechmeister, M."],["dc.date.accessioned","2020-12-10T18:11:43Z"],["dc.date.available","2020-12-10T18:11:43Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1051/0004-6361/201833694"],["dc.identifier.eissn","1432-0746"],["dc.identifier.issn","0004-6361"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/74117"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Detection of He I λ10830 Å absorption on HD 189733 b with CARMENES high-resolution transmission spectroscopy"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A24"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","632"],["dc.contributor.author","Fuhrmeister, B."],["dc.contributor.author","Czesla, S."],["dc.contributor.author","Hildebrandt, L."],["dc.contributor.author","Nagel, E."],["dc.contributor.author","Schmitt, J. H. M. M."],["dc.contributor.author","Hintz, D."],["dc.contributor.author","Johnson, E. N."],["dc.contributor.author","Sanz-Forcada, J."],["dc.contributor.author","Schöfer, P."],["dc.contributor.author","Jeffers, S. V."],["dc.contributor.author","Caballero, J. A."],["dc.contributor.author","Zechmeister, M."],["dc.contributor.author","Reiners, A."],["dc.contributor.author","Ribas, I."],["dc.contributor.author","Amado, P. J."],["dc.contributor.author","Quirrenbach, A."],["dc.contributor.author","Bauer, F. F."],["dc.contributor.author","Béjar, V. J. S."],["dc.contributor.author","Cortés-Contreras, M."],["dc.contributor.author","Díez-Alonso, E."],["dc.contributor.author","Dreizler, S."],["dc.contributor.author","Galadí-Enríquez, D."],["dc.contributor.author","Günther, E. W."],["dc.contributor.author","Kaminski, A."],["dc.contributor.author","Kürster, M."],["dc.contributor.author","Lafarga, M."],["dc.contributor.author","Montes, D."],["dc.date.accessioned","2020-04-06T07:56:28Z"],["dc.date.available","2020-04-06T07:56:28Z"],["dc.date.issued","2019-11-01"],["dc.description.abstract","The He I infrared (IR) triplet at 10830 AA is an important activity indicator for the Sun and in solar-type stars, however, it has rarely been studied in relation to M dwarfs to date. In this study, we use the time-averaged spectra of 319 single stars with spectral types ranging from M0.0 V to M9.0 V obtained with the CARMENES high resolution optical and near-infrared spectrograph at Calar Alto to study the properties of the He I IR triplet lines. In quiescence, we find the triplet in absorption with a decrease of the measured pseudo equivalent width (pEW) towards later sub-types. For stars later than M5.0 V, the He I triplet becomes undetectable in our study. This dependence on effective temperature may be related to a change in chromospheric conditions along the M dwarf sequence. When an emission in the triplet is observed, we attribute it to flaring. The absence of emission during quiescence is consistent with line formation by photo-ionisation and recombination, while flare emission may be caused by collisions within dense material. The He I triplet tends to increase in depth according to increasing activity levels, ultimately becoming filled in; however, we do not find a correlation between the pEW(He IR) and X-ray properties. This behaviour may be attributed to the absence of very inactive stars ($L_{\\rm X}/L_{\\rm bol}$ < -5.5) in our sample or to the complex behaviour with regard to increasing depth and filling in."],["dc.identifier.arxiv","1911.00246v1"],["dc.identifier.doi","10.1051/0004-6361/201936193"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/63790"],["dc.relation.issn","0004-6361"],["dc.relation.issn","1432-0746"],["dc.title","The CARMENES search for exoplanets around M dwarfs"],["dc.title.subtitle","The He I triplet at 10830 Å across the M dwarf sequence"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]