Exoplanets and Stellar Physics

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Ground-breaking Exoplanet Science with the ANDES spectrograph at the ELT

(2023)

Authors:

Enric Palle, Katia Biazzo, Emeline Bolmont, Paul Molliere, Katja Poppenhaeger, Jayne Birkby, Matteo Brogi, Gael Chauvin, Andrea Chiavassa, Jens Hoeijmakers, Emmanuel Lellouch, Christophe Lovis, Roberto Maiolino, Lisa Nortmann, Hannu Parviainen, Lorenzo Pino, Martin Turbet, Jesse Wender, Simon Albrecht, Simone Antoniucci, Susana C Barros, Andre Beaudoin, Bjorn Benneke, Isabelle Boisse, Aldo S Bonomo, Francesco Borsa, Alexis Brandeker, Wolfgang Brandner, Lars A Buchhave, Anne-Laure Cheffot, Robin Deborde, Florian Debras, Rene Doyon, Paolo Di Marcantonio, Paolo Giacobbe, Jonay I Gonzalez Hernandez, Ravit Helled, Laura Kreidberg, Pedro Machado, Jesus Maldonado, Alessandro Marconi, BL Canto Martins, Adriano Miceli, Christoph Mordasini, Mamadou N'Diaye, Andrezj Niedzielski, Brunella Nisini, Livia Origlia, Celine Peroux, Alex GM Pietrow, Enrico Pinna, Emily Rauscher, Sabine Reffert, Philippe Rousselot, Nicoletta Sanna, Adrien Simonnin, Alejandro Suarez Mascareno, Alessio Zanutta, Mathias Zechmeister

Methane throughout the atmosphere of the warm exoplanet WASP-80b

Nature Springer Nature 623:7988 (2023) 709-712

Authors:

Taylor J Bell, Luis Welbanks, Everett Schlawin, Michael R Line, Jonathan J Fortney, Thomas P Greene, Kazumasa Ohno, Vivien Parmentier, Emily Rauscher, Thomas G Beatty, Sagnick Mukherjee, Lindsey S Wiser, Martha L Boyer, Marcia J Rieke, John A Stansberry

ATMOSPHERIX: I- an open source high-resolution transmission spectroscopy pipeline for exoplanets atmospheres with SPIRou

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 527:1 (2023) 544-565

Authors:

Baptiste Klein, Florian Debras, Jean-François Donati, Thea Hood, Claire Moutou, Andres Carmona, Merwan Ould-elkhim, Bruno Bézard, Benjamin Charnay, Pascal Fouqué, Adrien Masson, Sandrine Vinatier, Clément Baruteau, Isabelle Boisse, Xavier Bonfils, Andrea Chiavassa, Xavier Delfosse, William Dethier, Guillaume Hebrard, Flavien Kiefer, Jérémy Leconte, Eder Martioli, Vivien Parmentier, Pascal Petit, William Pluriel, Franck Selsis, Lucas Teinturier, Pascal Tremblin, Martin Turbet, Olivia Venot, Aurélien Wyttenbach

ATMOSPHERIX: II- Characterizing exoplanet atmospheres through transmission spectroscopy with SPIRou

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 527:1 (2023) 566-582

Authors:

Florian Debras, Baptiste Klein, Jean-François Donati, Thea Hood, Claire Moutou, Andres Carmona, Benjamin Charnay, Bruno Bézard, Pascal Fouqué, Adrien Masson, Sandrine Vinatier, Clément Baruteau, Isabelle Boisse, Xavier Bonfils, Andrea Chiavassa, Xavier Delfosse, Guillaume Hebrard, Jérémy Leconte, Eder Martioli, Merwan Ould-elkhim, Vivien Parmentier, Pascal Petit, William Pluriel, Franck Selsis, Lucas Teinturier, Pascal Tremblin, Martin Turbet, Olivia Venot, Aurélien Wyttenbach

Stellar surface information from the Ca II H&K lines – I. Intensity profiles of the solar activity components

Monthly Notices of the Royal Astronomical Society Oxford University Press 527:2 (2023) 2940-2962

Authors:

M Cretignier, Agm Pietrow, S Aigrain

Abstract:

The detection of Earth-like planets with the radial-velocity (RV) method is currently limited by the presence of stellar activity signatures. On rotational time-scales, spots and plages (or faculae) are known to introduce different RV signals, but their corrections require better activity proxies. The best-known chromospheric activity proxies in the visible are the Ca II H&K lines, but the physical quantities measured by their profiles need to be clarified. We first investigate resolved images of the Sun in order to better understand the spectrum of plages, spots, and the network using the Meudon spectroheliogram. We show that distinct line profiles are produced by plages, spots, and by the network component and we also derived the centre-to-limb variations of the three profiles. Some care is required to disentangle their contributions due to their similarities. By combining disc-integrated spectra from the ISS high-resolution spectrograph with SDO direct images of the Sun, we managed to extract a high-resolution emission spectrum of the different components, which tend to confirm the spectra extracted from the Meudon spectroheliogram datacubes. Similar results were obtained with the HARPS-N Sun-as-a-star spectra. We concluded using a three-component model that the temporal variation of the popular Sindex contains, on average for the 24th solar cycle: 70 ± 12 per cent of plage, 26 ± 12 per cent of network, and 4 ± 4 per cent of spots. This preliminary investigation suggests that a detailed study of the Ca II H&K profiles may provide rich information about the filling factor and distribution of different types of active regions.