Solanki, Sami K.

[["dc.bibliographiccitation.firstpage","A69"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","636"],["dc.contributor.author","Amazo-Gómez, E. M."],["dc.contributor.author","Shapiro, A. I."],["dc.contributor.author","Solanki, S. K."],["dc.contributor.author","Krivova, N. A."],["dc.contributor.author","Kopp, G."],["dc.contributor.author","Reinhold, T."],["dc.contributor.author","Oshagh, M."],["dc.contributor.author","Reiners, A."],["dc.date.accessioned","2021-04-14T08:26:43Z"],["dc.date.available","2021-04-14T08:26:43Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1051/0004-6361/201936925"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/82050"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1432-0746"],["dc.relation.issn","0004-6361"],["dc.title","Inflection point in the power spectrum of stellar brightness variations"],["dc.title.alternative","II. The Sun"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","A157"],["dc.bibliographiccitation.journal","Astronomy & Astrophysics"],["dc.bibliographiccitation.volume","627"],["dc.contributor.author","Cernetic, M."],["dc.contributor.author","Shapiro, A. I."],["dc.contributor.author","Witzke, V."],["dc.contributor.author","Krivova, N. A."],["dc.contributor.author","Solanki, S. K."],["dc.contributor.author","Tagirov, R. V."],["dc.date.accessioned","2019-08-01T08:39:30Z"],["dc.date.available","2019-08-01T08:39:30Z"],["dc.date.issued","2019"],["dc.description.abstract","Contex. Stellar spectra synthesis is essential for the characterization of potential planetary hosts. In addition, comprehensive stellar variability calculations with fast radiative transfer are needed to disentangle planetary transits from stellar magnetically-driven variability. The planet-hunting space telescopes, such as CoRoT, Kepler, and TESS will bring vast quantities of data, rekindling the interest in fast calculations of the radiative transfer. Aims. We revisit the Opacity Distribution Functions (ODF) approach routinely applied to speedup stellar spectral synthesis. To achieve a considerable speedup relative to the current state-of-the-art, we further optimize the approach and search for the best ODF configuration. Furthermore, we generalize the ODF approach for fast calculations of flux in various filters often used in stellar observations. Methods. In a parameter-sweep-fashion, we generated ODF in the spectral range from UV to IR with different setups. The most accurate ODF configuration for each spectral interval was determined. For calculations of the radiative fluxes through filters we adapted the wavelength grid based on the transmission curve, whereafter the normal ODF procedure was performed. Results. Our optimum ODF configuration allows for a three fold speedup, compared to the previously used ODF configurations. The ODF generalization to calculate fluxes through filters results in a speedup of more than two orders of magnitude."],["dc.identifier.arxiv","1906.03112v2"],["dc.identifier.doi","10.1051/0004-6361/201935723"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62252"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0004-6361"],["dc.relation.issn","1432-0746"],["dc.title","Opacity distribution functions for stellar spectra synthesis"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A44"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","644"],["dc.contributor.author","Yelles Chaouche, L."],["dc.contributor.author","Cameron, R. H."],["dc.contributor.author","Solanki, Sami K."],["dc.contributor.author","Riethmüller, T. L."],["dc.contributor.author","Anusha, L. S."],["dc.contributor.author","Witzke, V."],["dc.contributor.author","Shapiro, A. I."],["dc.contributor.author","Barthol, P."],["dc.contributor.author","Gandorfer, A."],["dc.contributor.author","Gizon, Laurent"],["dc.contributor.author","Hirzberger, J."],["dc.contributor.author","van Noort, M."],["dc.contributor.author","Blanco Rodríguez, J."],["dc.contributor.author","Del Toro Iniesta, J. C."],["dc.contributor.author","Orozco Suárez, D."],["dc.contributor.author","Schmidt, W."],["dc.contributor.author","Martínez Pillet, V."],["dc.contributor.author","Knölker, M."],["dc.date.accessioned","2021-03-05T08:58:39Z"],["dc.date.available","2021-03-05T08:58:39Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1051/0004-6361/202037545"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/80199"],["dc.notes.intern","DOI Import GROB-393"],["dc.relation.eissn","1432-0746"],["dc.relation.issn","0004-6361"],["dc.title","Power spectrum of turbulent convection in the solar photosphere"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","The Astrophysical Journal. Supplement Series"],["dc.bibliographiccitation.volume","255"],["dc.contributor.author","Anusha, L. S."],["dc.contributor.author","Shapiro, A. I."],["dc.contributor.author","Witzke, V."],["dc.contributor.author","Cernetic, M."],["dc.contributor.author","Solanki, S. K."],["dc.contributor.author","Gizon, L."],["dc.date.accessioned","2021-08-12T07:46:07Z"],["dc.date.available","2021-08-12T07:46:07Z"],["dc.date.issued","2021"],["dc.identifier.doi","10.3847/1538-4365/abfb72"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/88622"],["dc.notes.intern","DOI Import GROB-448"],["dc.relation.eissn","1538-4365"],["dc.relation.issn","0067-0049"],["dc.title","Radiative Transfer with Opacity Distribution Functions: Application to Narrowband Filters"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A32"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","633"],["dc.contributor.author","Shapiro, A. I."],["dc.contributor.author","Amazo-Gómez, E. M."],["dc.contributor.author","Krivova, N. A."],["dc.contributor.author","Solanki, S. K."],["dc.date.accessioned","2020-12-10T18:11:51Z"],["dc.date.available","2020-12-10T18:11:51Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1051/0004-6361/201936018"],["dc.identifier.eissn","1432-0746"],["dc.identifier.issn","0004-6361"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/74161"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Inflection point in the power spectrum of stellar brightness variations"],["dc.title.alternative","I. The model"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A225"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","642"],["dc.contributor.author","Amazo-Gómez, E. M."],["dc.contributor.author","Shapiro, A. I."],["dc.contributor.author","Solanki, S. K."],["dc.contributor.author","Kopp, G."],["dc.contributor.author","Oshagh, M."],["dc.contributor.author","Reinhold, T."],["dc.contributor.author","Reiners, A."],["dc.date.accessioned","2021-04-14T08:31:44Z"],["dc.date.available","2021-04-14T08:31:44Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1051/0004-6361/202038926"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/83695"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1432-0746"],["dc.relation.issn","0004-6361"],["dc.title","Inflection point in the power spectrum of stellar brightness variations"],["dc.title.alternative","III. Facular versus spot dominance on stars with known rotation periods"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","21"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","The Astrophysical Journal"],["dc.bibliographiccitation.volume","914"],["dc.contributor.author","Sowmya, K."],["dc.contributor.author","Shapiro, A. I."],["dc.contributor.author","Witzke, V."],["dc.contributor.author","Nèmec, N.-E."],["dc.contributor.author","Chatzistergos, T."],["dc.contributor.author","Yeo, K. L."],["dc.contributor.author","Krivova, N. A."],["dc.contributor.author","Solanki, S. K."],["dc.date.accessioned","2021-07-05T14:57:57Z"],["dc.date.available","2021-07-05T14:57:57Z"],["dc.date.issued","2021"],["dc.identifier.doi","10.3847/1538-4357/abf247"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/87779"],["dc.notes.intern","DOI-Import GROB-441"],["dc.relation.eissn","1538-4357"],["dc.relation.issn","0004-637X"],["dc.title","Modeling Stellar Ca ii H and K Emission Variations. I. Effect of Inclination on the S-index"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A60"],["dc.bibliographiccitation.journal","Astronomy & Astrophysics"],["dc.bibliographiccitation.volume","666"],["dc.contributor.author","Kostogryz, N. M."],["dc.contributor.author","Witzke, V."],["dc.contributor.author","Shapiro, A. I."],["dc.contributor.author","Solanki, S. K."],["dc.contributor.author","Maxted, P. F. L."],["dc.contributor.author","Kurucz, R. L."],["dc.contributor.author","Gizon, L."],["dc.date.accessioned","2022-11-01T10:16:50Z"],["dc.date.available","2022-11-01T10:16:50Z"],["dc.date.issued","2022"],["dc.description.abstract","Context.\n The detection of the first exoplanet paved the way for the era of transit-photometry space missions with revolutionary photometric precision, whose aim is to discover new exoplanetary systems around different types of stars. With this high precision, it is possible to derive the radii of exoplanets very accurately, which is crucial for constraining their type and composition. However, it requires an accurate description of their host stars, especially their center-to-limb variation of intensities (so-called limb darkening) as it affects the planet-to-star radius ratio determination.\n \n \n Aims.\n We aim to improve the accuracy of limb-darkening calculations for stars with a wide range of fundamental parameters.\n \n \n Methods.\n We used the recently developed 1D Merged Parallelized Simplified ATLAS code to compute model atmosphere structures and to synthesize stellar limb darkening on a very fine grid of stellar parameters. For the computations, we utilized the most accurate information on chemical element abundances and mixing-length parameters, including convective overshoot. The stellar limb darkening was fitted using the two most accurate limb darkening laws: the power-2 and 4-parameter nonlinear laws.\n \n \n Results.\n We present a new extensive library of stellar model atmospheric structures, the synthesized stellar limb darkening curves, and the coefficients of parameterized limb-darkening laws on a very fine grid of stellar parameters in the\n Kepler,\n TESS, CHEOPS, and PLATO passbands. The fine grid allows the sizable errors, introduced by the need to interpolate, to be overcome. Our computations of solar limb darkening are in a good agreement with available solar measurements at different view angles and wavelengths. Our computations of stellar limb darkening agree well with available measurements of\n Kepler\n stars. A new grid of stellar model structures, limb darkening, and their fitted coefficients in different broad passbands are provided in online tables available at the CDS."],["dc.identifier.doi","10.1051/0004-6361/202243722"],["dc.identifier.pii","aa43722-22"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/116663"],["dc.notes.intern","DOI-Import GROB-605"],["dc.relation.eissn","1432-0746"],["dc.relation.issn","0004-6361"],["dc.title","Stellar limb darkening"],["dc.title.alternative","A new MPS-ATLAS library for\n Kepler,\n TESS, CHEOPS, and PLATO passbands,"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A43"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","636"],["dc.contributor.author","Nèmec, N.-E."],["dc.contributor.author","Shapiro, A. I."],["dc.contributor.author","Krivova, N. A."],["dc.contributor.author","Solanki, S. K."],["dc.contributor.author","Tagirov, R. V."],["dc.contributor.author","Cameron, R. H."],["dc.contributor.author","Dreizler, S."],["dc.date.accessioned","2020-12-10T18:11:56Z"],["dc.date.available","2020-12-10T18:11:56Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1051/0004-6361/202037588"],["dc.identifier.eissn","1432-0746"],["dc.identifier.issn","0004-6361"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/74188"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Power spectra of solar brightness variations at various inclinations"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]