AS
Alexander Shapiro
astro-ph.SRastro-ph.EPastro-ph.IMphysics.space-phphysics.ao-phastro-phastro-ph.GAphysics.data-an
On Valency
published · living versionsW_jbs2xsrs·v1 · currentpublished
Magnetic Activity as a Driver of Low-gravity-like Spectral Morphology in Late-M Dwarfs
with Chia-Lung Lin, Daniel Apai, Benjamin V. Rackham, Prajwal Niraula +5
1 version
W_786srhr7·v1published
Preprints & journals
94 papers in the corpus · 2007–2026Leveraging Impact Parameter to Mitigate the Transit Light Source Effect: Early Insights from TRAPPIST-12608.20450v2 · Ana Glidden, Alexander I. Shapiro, Sara Seager et al.2026 · 0 citationsAna Glidden et al 2026 ApJL 1008 L48
Towards understanding stellar variability at the sub m/s level: granulation-induced variability across the optical spectrum2608.02240v1 · Cis Lagae, Ginger Frame, Heather M. Cegla et al.2026 · 0 citationsarXiv
The Fe I 4377 Å Line as a Solar Faculae Indicator: Insights from Spectral Ratio Analysis2607.29455v1 · Katlyn L. Hobbs, Christopher A. Watson, Jean C. Costes et al.2026 · 0 citationsarXiv
A Scalable Path to Astrometric Exomoon Discoveries with the Nautilus Space Observatory2606.28523v2 · Kevin Wagner, Sumin Seung, D'aniel Apai et al.2026 · 0 citationsarXiv
Nautilus: Fast Time-Resolved Spectroscopy of GKM Stellar Flares and Their Implications for Planetary Habitability2606.26462v1 · Chia-Lung Lin, Adina D. Feinstein, Jeff Valenti et al.2026 · 0 citationsarXiv
Effect of surface magnetic fields on limb darkening in main-sequence stars2606.21912v1 · N. Kostogryz, A. I. Shapiro, V. Witzke et al.2026 · 0 citationsarXiv
Decoding the Radial Velocity Signatures of Solar Faculae with 3D MHD Simulations2605.22615v1 · Florian Kroll, Sowmya Krishnamurthy, Alexander Shapiro et al.2026 · 0 citationsarXiv
Sensitivity of spectral lines to granulation: from the Sun to K-type stars2605.20344v1 · V. Vasilyev, K. Sowmya, A. I. Shapiro et al.2026 · 1 citationarXiv
A single power law for the TRAPPIST-1 flare distribution across four orders of magnitude in energy2605.05468v2 · Valeriy Vasilyev, Alexander I. Shapiro, Nadiia Kostogryz et al.2026 · 0 citationsarXiv
Synthetic disk-integrated absorption lines isolating stellar granulation for high-precision RV studies2603.04382v1 · Ginger Frame, Heather Cegla, Cis Lagae et al.2026 · 0 citationsarXiv
Overestimated Pressure Broadening Misleads Model Spectra in Cool M Dwarf Stars2601.05313v1 · Ana Glidden, Veronika Witzke, Alexander I. Shapiro et al.2026 · 2 citationsarXiv
Simulations of facular magnetic fields on cool stars I: Main sequence stars with solar metallicity2512.22379v2 · Tanayveer Singh Bhatia, Robert H. Cameron, Sami K. Solanki et al.2025 · 4 citationsarXiv
The rotation-magnetism relationship in solar-type stars. Constraining magnetic flux emergence rates2512.18095v4 · Emre Isik, Sami K. Solanki, Natalie A. Krivova et al.2025 · 0 citationsarXiv
Deciphering transmission spectra by exploring the solar paradigm2512.06487v1 · Nina-Elisabeth Nemec, Oscar Porqueras- L'eon, Ignasi Ribas et al.2025 · 1 citationA&A 705, A111 (2026)
Separating flare and secondary atmospheric signals with RADYN modeling of near-infrared JWST transmission spectroscopy observations of TRAPPIST-12512.04265v1 · Ward S. Howard, Adam F. Kowalski, Michael Radica et al.2025 · 2 citationsApJL 994, L31, 2025
Sensitivity of spectral lines to granulation: The Sun2509.09824v2 · K. Sowmya, A. I. Shapiro, V. Vasilyev et al.2025 · 5 citationsarXiv
Flares on TRAPPIST-1 reveal the spectrum of magnetic features on its surface2508.04793v1 · Valeriy Vasilyev, Nadiia Kostogryz, Alexander I. Shapiro et al.2025 · 3 citationsarXiv
The effect of stellar magnetic activity on measurements of morning and evening asymmetry of planetary terminator2507.16451v1 · N. Kostogryz, A.I. Shapiro, L. Carone et al.2025 · 2 citationsarXiv
Modeling HMI observables for the study of solar oscillations2507.13756v1 · D. Fournier, N.M. Kostogryz, L. Gizon et al.2025 · 2 citationsA&A 702, A253 (2025)
Towards understanding stellar variability at the sub m/s level: Isolating granulation signals in synthetic spectral lines2504.17011v1 · Ginger Frame, Heather M. Cegla, Veronika Witzke et al.2025 · 6 citationsarXiv
Detectability of Solar Rotation Period Across Various Wavelengths2502.17719v1 · Valeriy Vasilyev, Timo Reinhold, Alexander I. Shapiro et al.2025 · 3 citationsarXiv
Solar variability in the Mg II h and k lines2501.03081v1 · K. Sowmya, M. Snow, A. I. Shapiro et al.2025 · 3 citationsarXiv
Sun-like stars produce superflares roughly once per century.39666785 · Vasilyev, Valeriy, Reinhold, Timo, Shapiro, Alexander I et al.2024 · 37 citationsScience (New York, N.Y.). 2024;386(6727):1301-1305
First Calculations of Starspot Spectra based on 3D Radiative Magnetohydrodynamics Simulations2411.14056v2 · H. N. Smitha, Alexander I. Shapiro, Veronika Witzke et al.2024 · 25 citationsarXiv
Reliable Transmission Spectrum Extraction with a Three-Parameter Limb Darkening Law2410.18617v1 · Rosa E. Keers, Alexander I. Shapiro, Nadiia M. Kostogryz et al.2024 · 7 citationsarXiv
Low-latitude magnetic flux emergence on rapidly rotating solar-type stars2410.14869v2 · Emre Is\ik, Sami K. Solanki, Robert H. Cameron et al.2024 · 7 citationsAstrophys. J. 976, 215 (2024)
The PLATO Mission2406.05447v2 · Heike Rauer, Conny Aerts, Juan Cabrera et al.2024 · 13 citationsarXiv
Stellar Surface Magnetic Fields Impact Limb Darkening2403.00118v1 · Nadiia M. Kostogryz, Alexander I. Shapiro, Veronika Witzke et al.2024 · 1 citationarXiv
A roadmap for the atmospheric characterization of terrestrial exoplanets with JWST2310.15895v3 · TRAPPIST-1 JWST Community Initiative: Julien de Wit, Ren'e Doyon, Benjamin V. Rackham et al.2023 · 37 citationsNature Astronomy (2024) 8, 810-818
Testing MURaM and MPS-ATLAS against the quiet solar spectrum2310.05652v1 · Veronika Witzke, Alexander I. Shapiro, Nadiia M. Kostogryz et al.2023 · 18 citationsA&A 681, A81 (2024)
Modeling Stellar CaII H & K Emission Variations: Spot Contribution to the S-index2309.03690v3 · K. Sowmya, A. I. Shapiro, L. H. M. Rouppe van der Voort et al.2023 · 1 citationarXiv
New rotation period measurements of 67,163 Kepler stars2308.04272v1 · Timo Reinhold, Alexander I. Shapiro, Sami K. Solanki et al.2023 · 28 citationsA&A 678, A24 (2023)
Spectral variability of photospheric radiation due to faculae II: Facular contrasts for cool main-sequence stars2306.04669v1 · Charlotte M. Norris, Yvonne C. Unruh, Veronika Witzke et al.2023 · 28 citationsarXiv
Metal-rich stars are less suitable for the evolution of life on their planets.37072387 · Shapiro, Anna V, Brühl, Christoph, Klingmüller, Klaus et al.2023 · 10 citationsNature communications. 2023;14(1):1893
Forward modelling of brightness variations in Sun-like stars -- II. Light curves and variability2303.03040v1 · N.-E. Nemec, A. I. Shapiro, E. Isik et al.2023 · 7 citationsA&A 672, A138 (2023)
MPS-ATLAS library of stellar model atmospheres and spectra2303.02685v1 · N. Kostogryz, A. I Shapiro, V. Witzke et al.2023 · 23 citationsarXiv
Can 1D radiative equilibrium models of faculae be used for calculating contamination of transmission spectra?2211.02860v1 · Veronika Witzke, Alexander I. Shapiro, Nadiia M. Kostogryz et al.2022 · 27 citationsarXiv
Small-scale dynamo in cool main sequence stars. II. The effect of metallicity2211.02722v1 · V. Witzke, H. B. Duehnen, A. I. Shapiro et al.2022 · 19 citationsA&A 669, A157 (2023)
Superflares on solar-like stars: A new method for identifying the true flare sources in photometric surveys2209.13903v1 · Valeriy Vasilyev, Timo Reinhold, Alexander I. Shapiro et al.2022 · 11 citationsA&A 668, A167 (2022)
Measuring periods in aperiodic light curves -- Applying the GPS method to infer rotation periods of solar-like stars2209.12593v1 · Timo Reinhold, Alexander I. Shapiro, Sami K. Solanki et al.2022 · 7 citationsarXiv
Faculae cancel out on the surfaces of active Suns2207.06816v1 · N.-E. Nemec, A. I. Shapiro, E. Is\ik et al.2022 · 19 citationsarXiv
Predictions of Astrometric Jitter for Sun-like Stars. III. Fast Rotators2206.07702v2 · K. Sowmya, N.-E. Nemec, A. I. Shapiro et al.2022 · 12 citationsarXiv
Stellar limb darkening. A new MPS-ATLAS library for Kepler, TESS, CHEOPS, and PLATO passbands2206.06641v2 · N. M. Kostogryz, V. Witzke, A. I. Shapiro et al.2022 · 37 citationsA&A 666, A60 (2022)
Small-scale Dynamo in Cool Stars: I. Changes in stratification and near-surface convection for main-sequence spectral types2206.00064v2 · Tanayveer S. Bhatia, Robert H. Cameron, Sami K. Solanki et al.2022 · 30 citationsA&A 663, A166 (2022)
Chromospheric Extension of the MURaM Code2204.03126v1 · D. Przybylski, R. Cameron, S.K. Solanki et al.2022 · 56 citationsA&A 664, A91 (2022)
The Effect of Stellar Contamination on Low-resolution Transmission Spectroscopy: Needs Identified by NASA's Exoplanet Exploration Program Study Analysis Group 212201.09905v2 · Benjamin V. Rackham, N'estor Espinoza, Svetlana V. Berdyugina et al.2022 · 88 citationsarXiv
Multiwavelength Mitigation of Stellar Activity in Astrometric Planet Detection2112.06383v2 · Avi Kaplan-Lipkin, Bruce Macintosh, Alexander Madurowicz et al.2021 · 8 citations2022 AJ 163 205
Predictions of Astrometric Jitter for Sun-like Stars. II. Dependence on Inclination, Metallicity, and Active-Region Nesting2107.01493v1 · K. Sowmya, N.-E. Nemec, A. I. Shapiro et al.2021 · 18 citations2021, ApJ, 919, 94
MPS-ATLAS: A fast all-in-one code for synthesising stellar spectra2105.13611v1 · V. Witzke, A. I. Shapiro, M. Cernetic et al.2021 · 44 citationsA&A 653, A65 (2021)
Radiative transfer with opacity distribution functions: Application to narrow band filters2104.13661v1 · L. S. Anusha, A. I. Shapiro, V. Witzke et al.2021 · 8 citationsarXiv
Career total: at least 320 works. 94 are in this corpus.Showing the 50 most recent.
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