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CORDIS

REVEALing Signatures of Habitable Worlds Hidden by Stellar Activity

CORDIS provides links to public deliverables and publications of HORIZON projects.

Links to deliverables and publications from FP7 projects, as well as links to some specific result types such as dataset and software, are dynamically retrieved from OpenAIRE .

Deliverables

Publications

First Calculations of Starspot Spectra Based on 3D Radiative Magnetohydrodynamics Simulations (opens in new window)

Author(s): H. N. Smitha, Alexander I. Shapiro, Veronika Witzke, Nadiia M. Kostogryz, Yvonne C. Unruh, Tanayveer S. Bhatia, Robert Cameron, Sara Seager, Sami K. Solanki
Published in: The Astrophysical Journal Letters, Issue 978, 2024, ISSN 2041-8205
Publisher: American Astronomical Society
DOI: 10.3847/2041-8213/AD9AAA

Modeling Helioseismic and Magnetic Imager observables for the study of solar oscillations (opens in new window)

Author(s): D. Fournier; N. Kostogryz; L. Gizon; J. Schou; V. Witzke; A.I. Shapiro; I. Milić
Published in: Astronomy and Astrophysics, 2025, ISSN 1432-0746
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202556482

Detectability of Solar Rotation Period across Various Wavelengths (opens in new window)

Author(s): Valeriy Vasilyev, Timo Reinhold, Alexander I. Shapiro, Theodosios Chatzistergos, Natalie Krivova, Sami K. Solanki
Published in: The Astrophysical Journal Letters, Issue 980, 2025, ISSN 2041-8205
Publisher: American Astronomical Society
DOI: 10.3847/2041-8213/ADB0B3

Sensitivity of Spectral Lines to Granulation: The Sun (opens in new window)

Author(s): K. Sowmya, A. I. Shapiro, V. Vasilyev, V. Witzke, A. Collier Cameron, S. K. Solanki
Published in: The Astrophysical Journal, Issue 1003, 2026, ISSN 0004-637X
Publisher: American Astronomical Society
DOI: 10.3847/1538-4357/AE6102

The Detection-versus-retrieval Challenge: Titan as an Exoplanet (opens in new window)

Author(s): Prajwal Niraula, Julien de Wit, Robert J. Hargreaves, Iouli E. Gordon, Clara Sousa-Silva
Published in: The Astrophysical Journal Letters, Issue 995, 2025, ISSN 2041-8205
Publisher: American Astronomical Society
DOI: 10.3847/2041-8213/AE27C2

NASA’s Pandora SmallSat Mission: Simulating the Impact of Stellar Photospheric Heterogeneity and Its Correction (opens in new window)

Author(s): Benjamin V. Rackham, Aishwarya R. Iyer, Dániel Apai, Peter McGill, Yoav Rotman, Knicole D. Colón, Brett M. Morris, Emily A. Gilbert, Elisa V. Quintana, Jessie L. Dotson, Thomas Barclay, Pete Supsinskas, Jordan Karburn, Christina Hedges, Jason F. Rowe, David R. Ciardi, Jessie L. Christiansen, Trevor O. Foote, Thomas P. Greene, Kelsey Hoffman, Rae Holcomb, Aurora Y. Kesseli, Veselin B. Kostov, Nikole K. Lewis, James P. Mason, Gregory Mosby, Susan E. Mullally, Joshua E. Schlieder, Megan Weiner Mansfield, Luis Welbanks, Allison Youngblood
Published in: The Astronomical Journal, Issue 171, 2026, ISSN 0004-6256
Publisher: American Astronomical Society
DOI: 10.3847/1538-3881/AE5F63

Helium Atmospheres May Hide in Current Exoplanet Analysis Frameworks (opens in new window)

Author(s): Julien de Wit, Aaron Householder, Prajwal Niraula
Published in: The Astrophysical Journal Letters, Issue 996, 2026, ISSN 2041-8205
Publisher: American Astronomical Society
DOI: 10.3847/2041-8213/AE2F5C

Flares on TRAPPIST-1 Reveal the Spectrum of Magnetic Features on Its Surface (opens in new window)

Author(s): Valeriy Vasilyev, Nadiia Kostogryz, Alexander I. Shapiro, Astrid M. Veronig, Benjamin V. Rackham, Christoph Schirninger, Julien de Wit, Ward Howard, Jeff Valenti, Adina D. Feinstein, Olivia Lim, Sara Seager, Laurent Gizon, Sami K. Solanki
Published in: The Astrophysical Journal Letters, Issue 989, 2025, ISSN 2041-8205
Publisher: American Astronomical Society
DOI: 10.3847/2041-8213/ADF841

Synthetic disc-integrated absorption lines isolating stellar granulation for high-precision RV studies (opens in new window)

Author(s): Ginger Frame, Heather M Cegla, Cis Lagae, Veronika Witzke, Christopher Watson, Sergiy Shelyag, Vatsal Panwar, Michael L Palumbo, Alexander Shapiro
Published in: Monthly Notices of the Royal Astronomical Society, Issue 547, 2026, ISSN 0035-8711
Publisher: Oxford University Press (OUP)
DOI: 10.1093/MNRAS/STAG418

Molecular Hydrogen Controls the Temperatures of Flares on TRAPPIST-1 (opens in new window)

Author(s): A. I. Shapiro, N. Kostogryz, S. Seager, V. Witzke, J. de Wit, V. Vasilyev, Astrid M. Veronig, Cameron Robert, Peter Hardi, S. K. Solanki
Published in: The Astrophysical Journal Letters, Issue 998, 2026, ISSN 2041-8205
Publisher: American Astronomical Society
DOI: 10.3847/2041-8213/AE328B

Two temperate Earth- and Neptune-sized planets orbiting fully convective M dwarfs (opens in new window)

Author(s): Madison G Scott, Georgina Dransfield, Mathilde Timmermans, Amaury H M J Triaud, Benjamin V Rackham, Khalid Barkaoui, Adam J Burgasser, Karen A Collins, Michaël Gillon, Steve B Howell, Alan M Levine, Francisco J Pozuelos, Keivan G Stassun, Carl Ziegler, Yilen Gomez Maqueo Chew, Catherine A Clark, Yasmin Davis, Fatemeh Davoudi, Tansu Daylan, Brice-Olivier Demory, Dax Feliz, Akihiko Fukui, Maximilian N Günther, Emmanuël Jehin, Florian Lienhard, Andrew W Mann, Clàudia Janó Muñoz, Norio Narita, Peter P Pedersen, Richard P Schwarz, Avi Shporer, Abderahmane Soubkiou, Sebastián Zúñiga-Fernández
Published in: Monthly Notices of the Royal Astronomical Society, Issue 547, 2026, ISSN 0035-8711
Publisher: Oxford University Press (OUP)
DOI: 10.1093/MNRAS/STAG070

Solar Variability in the Mg ii h and k Lines (opens in new window)

Author(s): K. Sowmya, M. Snow, A. I. Shapiro, N. A. Krivova, T. Chatzistergos, S. K. Solanki
Published in: The Astrophysical Journal, Issue 980, 2025, ISSN 0004-637X
Publisher: American Astronomical Society
DOI: 10.3847/1538-4357/ADA6AF

The Effect of Stellar Magnetic Activity on Measurements of Morning and Evening Asymmetry of Planetary Terminator (opens in new window)

Author(s): N. Kostogryz, A. I. Shapiro, L. Carone, L. Gizon, Ch. Helling, S. Kiefer, S. Mercier, S. Seager, S. K. Solanki, Y. Unruh, J. de Wit, V. Witzke
Published in: The Astrophysical Journal Letters, Issue 989, 2025, ISSN 2041-8205
Publisher: American Astronomical Society
DOI: 10.3847/2041-8213/ADF0FB

Deciphering transmission spectra by exploring the solar paradigm (opens in new window)

Author(s): N.-E. Nèmec, Ò. Porqueras-León, I. Ribas, A. I. Shapiro
Published in: Astronomy & Astrophysics, Issue 705, 2026, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202557325

Hubble’s Multiyear Search for Exospheres in the TRAPPIST-1 System Reveals Frequent Microflares (opens in new window)

Author(s): David Berardo, Julien de Wit, Michael Gillon, Ward S. Howard, Vincent Bourrier, Emeline Bolmont, Matthew W. Cotton, Florian Quatresooz, Léonie Hoerner, Artem Burdanov, Adam J. Burgasser, Brice-Olivier Demory, David Ehrenreich, Susan M. Lederer, Benjamin V. Rackham, Sara Seager, Amaury Triaud
Published in: The Astrophysical Journal Letters, Issue 998, 2026, ISSN 2041-8205
Publisher: American Astronomical Society
DOI: 10.3847/2041-8213/AE3F2B

Solar flares versus solar energetic particle events: Probabilistic projections to extreme events (opens in new window)

Author(s): Sergey Koldobskiy, Ilya Usoskin, Valeriy Vasilyev, Alexander I. Shapiro
Published in: Astronomy & Astrophysics, Issue 702, 2025, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202556069

Gravity-sensitive Spectral Indices in Ultracool Dwarfs: Investigating Correlations with Metallicity and Planet Occurrence Using SpeX and Fire Observations (opens in new window)

Author(s): Fatemeh Davoudi, Benjamin V. Rackham, Julien de Wit, Jan Toomlaid, Michaël Gillon, Amaury H. M. J. Triaud, Adam J. Burgasser, Christopher A. Theissen
Published in: The Astronomical Journal, Issue 170, 2025, ISSN 0004-6256
Publisher: American Astronomical Society
DOI: 10.3847/1538-3881/ADF83F

Sun-like stars produce superflares roughly once per century (opens in new window)

Author(s): Valeriy Vasilyev, Timo Reinhold, Alexander I. Shapiro, Ilya Usoskin, Natalie A. Krivova, Hiroyuki Maehara, Yuta Notsu, Allan Sacha Brun, Sami K. Solanki, Laurent Gizon
Published in: Science, Issue 386, 2024, ISSN 0036-8075
Publisher: American Association for the Advancement of Science (AAAS)
DOI: 10.1126/SCIENCE.ADL5441

Why Observations at Mid-infrared Wavelengths Partially Mitigate M Dwarf Star Host Stellar Activity Contamination in Exoplanet Transmission Spectroscopy (opens in new window)

Author(s): Sara Seager, Alexander I. Shapiro
Published in: The Astrophysical Journal, Issue 970, 2024, ISSN 0004-637X
Publisher: American Astronomical Society
DOI: 10.3847/1538-4357/AD509A

Stellar Models Also Limit Exoplanet Atmosphere Studies in Emission (opens in new window)

Author(s): Thomas J. Fauchez, Elsa Ducrot, Benjamin V. Rackham, Kevin B. Stevenson, L. C. Mayorga, Julien de Wit
Published in: The Astrophysical Journal, Issue 989, 2025, ISSN 0004-637X
Publisher: American Astronomical Society
DOI: 10.3847/1538-4357/ADF068

Monthly Notices of the Royal Astronomical Society (opens in new window)

Author(s): Ginger Frame; Heather M Cegla; Veronika Witzke; Cis Lagae; Michael L Palumbo III; Sergiy Shelyag; Christopher Watson; Alexander Shapiro
Published in: Monthly Notices of the Royal Astronomical Society, 2025, ISSN 0035-8711
Publisher: Blackwell Publishing Inc.
DOI: 10.48550/ARXIV.2504.17011

Simulations of facular magnetic fields on cool stars (opens in new window)

Author(s): Tanayveer Singh Bhatia, Robert H. Cameron, Sami K. Solanki, Damien F. Przybylski, Veronika Witzke, Alexander Shapiro, Nadiia Kostogryz
Published in: Astronomy & Astrophysics, Issue 706, 2026, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202555256

Overestimated Pressure Broadening Misleads Model Spectra in Cool M Dwarf Stars (opens in new window)

Author(s): Ana Glidden, Veronika Witzke, Alexander I. Shapiro, Sara Seager
Published in: The Astrophysical Journal Letters, Issue 997, 2026, ISSN 2041-8205
Publisher: American Astronomical Society
DOI: 10.3847/2041-8213/AE3137

Reliable Transmission Spectrum Extraction with a Three-parameter Limb-darkening Law (opens in new window)

Author(s): Rosa E. Keers, Alexander I. Shapiro, Nadiia M. Kostogryz, Ana Glidden, Prajwal Niraula, Benjamin V. Rackham, Sara Seager, Sami K. Solanki, Yvonne C. Unruh, Valeriy Vasilyev, Julien de Wit
Published in: The Astrophysical Journal Letters, Issue 977, 2024, ISSN 2041-8205
Publisher: American Astronomical Society
DOI: 10.3847/2041-8213/AD8B51

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