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Main Authors:	Allart, Romain, Carteret, Yann, Bourrier, Vincent, Mignon, Lucile, Baron, Frederique, Cadieux, Charles, Carmona, Andres, Lovis, Christophe, Chakraborty, Hritam, Delgado-Mena, Elisa, Artigau, Etienne, Barros, Susana C. C., Benneke, Bjorn, Bonfils, Xavier, Bouchy, Francois, Bryan, Marta, Martins, Bruno L. Canto, Cloutier, Ryan, Cook, Neil J., Cowan, Nicolas B., Delfosse, Xavier, Doyon, Rene, Dumusque, Xavier, Ehrenreich, David, Hernandez, Jonay I. Gonzalez, Lafreniere, David, Leao, Izan de Castro, Malo, Lison, Melo, Claudio, Mordasini, Christoph, Pepe, Francesco, Rebolo, Rafael, De Medeiros, Jose Renan, Rowe, Jason, Santos, Nuno C., Segransan, Damien, Mascareno, Alejandro Suarez, Udry, Stephane, Valencia, Diana, Wade, Gregg, Abreu, Manuel, Aguiar, Jose L. A., Akinsanmi, Babatunde, Allain, Guillaume, Almenara, Jose Manuel, Moulla, Khaled Al, Arial, Tomy, Auger, Hugues, Bazinet, Luc, Blind, Nicolas, Boucher, Anne, Broeg, Christopher, Brousseau, Denis, Cabral, Alexandre, Challita, Zalpha, Coelho, Joao, Cointepas, Marion, Silva, Ana Rita Costa, Cristo, Eduardo, Darveau-Bernier, Antoine, Dauplaise, Laurie, Gomes, Roseane de Lima, de Freitas, Daniel Brito, Fontinele, Dasaev O., Forveille, Thierry, Frensch, Yolanda, Gagne, Jonathan, Genest, Frederic, Temich, Felix Gracia, Grieves, Nolan, Hernandez, Olivier, Hoeijmakers, Jens, Hubin, Norbert, Jahandar, Farbod, Jayawardhana, Ray, Kerley, Dan, Kolb, Johann, Krishnamurthy, Vigneshwaran, L'Heureux, Alexandrine, Lendl, Monika, Lim, Olivia, Curto, Gaspare Lo, Matthews, Jaymie, Martins, Allan M., Mayer, Jean-Sebastien, Metchev, Stan, Messias, Yuri S., Moranta, Leslie, Mounzer, Dany, Nari, Nicola, Nielsen, Louise D., Osborn, Ares, Parc, Lena, Pasquini, Luca, Pelletier, Stefan, Peroux, Celine, Piaulet, Caroline, Plotnykov, Mykhaylo, Pompei, Emanuela, Poulin-Girard, Anne-Sophie, Psaridi, Angelica, Rasilla, Jose Luis, Reshetov, Vladimir, Saint-Antoine, Jonathan, Sanz-Forcada, Jorge, Seidel, Julia, Saviane, Ivo, da Silva, Joao Gomes, Sosnowska, Danuta, Srivastava, Avidaan, Stefanov, Atanas K., Teixeira, Marcio A., Thibault, Simon, Vallee, Philippe, Vandal, Thomas, Vaulato, Valentina, Wardenier, Joost P., Wehbe, Bachar, Weisserman, Drew, Wildi, Francois, Yariv, Vincent, Zins, Gerard
Format:	Preprint
Published:	2025
Subjects:	Earth and Planetary Astrophysics
Online Access:	https://arxiv.org/abs/2507.21284
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_version_	1866916868066902016
author	Allart, Romain Carteret, Yann Bourrier, Vincent Mignon, Lucile Baron, Frederique Cadieux, Charles Carmona, Andres Lovis, Christophe Chakraborty, Hritam Delgado-Mena, Elisa Artigau, Etienne Barros, Susana C. C. Benneke, Bjorn Bonfils, Xavier Bouchy, Francois Bryan, Marta Martins, Bruno L. Canto Cloutier, Ryan Cook, Neil J. Cowan, Nicolas B. Delfosse, Xavier Doyon, Rene Dumusque, Xavier Ehrenreich, David Hernandez, Jonay I. Gonzalez Lafreniere, David Leao, Izan de Castro Malo, Lison Melo, Claudio Mordasini, Christoph Pepe, Francesco Rebolo, Rafael De Medeiros, Jose Renan Rowe, Jason Santos, Nuno C. Segransan, Damien Mascareno, Alejandro Suarez Udry, Stephane Valencia, Diana Wade, Gregg Abreu, Manuel Aguiar, Jose L. A. Akinsanmi, Babatunde Allain, Guillaume Almenara, Jose Manuel Moulla, Khaled Al Arial, Tomy Auger, Hugues Bazinet, Luc Blind, Nicolas Boucher, Anne Broeg, Christopher Brousseau, Denis Cabral, Alexandre Challita, Zalpha Coelho, Joao Cointepas, Marion Silva, Ana Rita Costa Cristo, Eduardo Darveau-Bernier, Antoine Dauplaise, Laurie Gomes, Roseane de Lima de Freitas, Daniel Brito Fontinele, Dasaev O. Forveille, Thierry Frensch, Yolanda Gagne, Jonathan Genest, Frederic Temich, Felix Gracia Grieves, Nolan Hernandez, Olivier Hoeijmakers, Jens Hubin, Norbert Jahandar, Farbod Jayawardhana, Ray Kerley, Dan Kolb, Johann Krishnamurthy, Vigneshwaran L'Heureux, Alexandrine Lendl, Monika Lim, Olivia Curto, Gaspare Lo Matthews, Jaymie Martins, Allan M. Mayer, Jean-Sebastien Metchev, Stan Messias, Yuri S. Moranta, Leslie Mounzer, Dany Nari, Nicola Nielsen, Louise D. Osborn, Ares Parc, Lena Pasquini, Luca Pelletier, Stefan Peroux, Celine Piaulet, Caroline Plotnykov, Mykhaylo Pompei, Emanuela Poulin-Girard, Anne-Sophie Psaridi, Angelica Rasilla, Jose Luis Reshetov, Vladimir Saint-Antoine, Jonathan Sanz-Forcada, Jorge Seidel, Julia Saviane, Ivo da Silva, Joao Gomes Sosnowska, Danuta Srivastava, Avidaan Stefanov, Atanas K. Teixeira, Marcio A. Thibault, Simon Vallee, Philippe Vandal, Thomas Vaulato, Valentina Wardenier, Joost P. Wehbe, Bachar Weisserman, Drew Wildi, Francois Yariv, Vincent Zins, Gerard
author_facet	Allart, Romain Carteret, Yann Bourrier, Vincent Mignon, Lucile Baron, Frederique Cadieux, Charles Carmona, Andres Lovis, Christophe Chakraborty, Hritam Delgado-Mena, Elisa Artigau, Etienne Barros, Susana C. C. Benneke, Bjorn Bonfils, Xavier Bouchy, Francois Bryan, Marta Martins, Bruno L. Canto Cloutier, Ryan Cook, Neil J. Cowan, Nicolas B. Delfosse, Xavier Doyon, Rene Dumusque, Xavier Ehrenreich, David Hernandez, Jonay I. Gonzalez Lafreniere, David Leao, Izan de Castro Malo, Lison Melo, Claudio Mordasini, Christoph Pepe, Francesco Rebolo, Rafael De Medeiros, Jose Renan Rowe, Jason Santos, Nuno C. Segransan, Damien Mascareno, Alejandro Suarez Udry, Stephane Valencia, Diana Wade, Gregg Abreu, Manuel Aguiar, Jose L. A. Akinsanmi, Babatunde Allain, Guillaume Almenara, Jose Manuel Moulla, Khaled Al Arial, Tomy Auger, Hugues Bazinet, Luc Blind, Nicolas Boucher, Anne Broeg, Christopher Brousseau, Denis Cabral, Alexandre Challita, Zalpha Coelho, Joao Cointepas, Marion Silva, Ana Rita Costa Cristo, Eduardo Darveau-Bernier, Antoine Dauplaise, Laurie Gomes, Roseane de Lima de Freitas, Daniel Brito Fontinele, Dasaev O. Forveille, Thierry Frensch, Yolanda Gagne, Jonathan Genest, Frederic Temich, Felix Gracia Grieves, Nolan Hernandez, Olivier Hoeijmakers, Jens Hubin, Norbert Jahandar, Farbod Jayawardhana, Ray Kerley, Dan Kolb, Johann Krishnamurthy, Vigneshwaran L'Heureux, Alexandrine Lendl, Monika Lim, Olivia Curto, Gaspare Lo Matthews, Jaymie Martins, Allan M. Mayer, Jean-Sebastien Metchev, Stan Messias, Yuri S. Moranta, Leslie Mounzer, Dany Nari, Nicola Nielsen, Louise D. Osborn, Ares Parc, Lena Pasquini, Luca Pelletier, Stefan Peroux, Celine Piaulet, Caroline Plotnykov, Mykhaylo Pompei, Emanuela Poulin-Girard, Anne-Sophie Psaridi, Angelica Rasilla, Jose Luis Reshetov, Vladimir Saint-Antoine, Jonathan Sanz-Forcada, Jorge Seidel, Julia Saviane, Ivo da Silva, Joao Gomes Sosnowska, Danuta Srivastava, Avidaan Stefanov, Atanas K. Teixeira, Marcio A. Thibault, Simon Vallee, Philippe Vandal, Thomas Vaulato, Valentina Wardenier, Joost P. Wehbe, Bachar Weisserman, Drew Wildi, Francois Yariv, Vincent Zins, Gerard
contents	Near-infrared high-resolution echelle spectrographs unlock access to fundamental properties of exoplanets, from their atmospheric escape and composition to their orbital architecture, which can all be studied simultaneously from transit observations. We present the first results of the newly commissioned ESO near-infrared spectrograph, NIRPS, from three transits of WASP-69b. We used the RM Revolutions technique to better constrain the orbital architecture of the system. We extracted the high-resolution helium absorption profile to study its spectral shape and temporal variations. Then, we made 3D simulations from the EVE code to fit the helium absorption time series. We measure a slightly misaligned orbit for WASP-69b (psi of 28.7+/-5.7 deg). We confirm the detection of helium with an average excess absorption of 3.17+/-0.05%. The helium absorption is spectrally and temporally resolved, extends to high altitudes and has a strong velocity shift up to -29.5+/-2.5 km/s 50 minutes after egress. EVE simulations put constraints on the mass loss of 2.25 10^11 g/s and hint at reactive chemistry within the cometary-like tail and interaction with the stellar winds that allow the metastable helium to survive longer than expected. Our results suggest that WASP-69b is undergoing a transformative phase in its history, losing mass while evolving on a misaligned orbit. This work shows how combining multiple observational tracers such as orbital architecture, atmospheric escape, and composition, is critical to understand exoplanet demographics and their formation and evolution. We demonstrate that NIRPS can reach precisions similar to HARPS for RM studies, and the high data quality of NIRPS leads to unprecedented atmospheric characterization. The high stability of NIRPS combined with the large GTO available for its consortium, enables in-depth studies of exoplanets as well as large population surveys.
format	Preprint
id	arxiv_https___arxiv_org_abs_2507_21284
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	NIRPS detection of delayed atmospheric escape from the warm and misaligned Saturn-mass exoplanet WASP-69b Allart, Romain Carteret, Yann Bourrier, Vincent Mignon, Lucile Baron, Frederique Cadieux, Charles Carmona, Andres Lovis, Christophe Chakraborty, Hritam Delgado-Mena, Elisa Artigau, Etienne Barros, Susana C. C. Benneke, Bjorn Bonfils, Xavier Bouchy, Francois Bryan, Marta Martins, Bruno L. Canto Cloutier, Ryan Cook, Neil J. Cowan, Nicolas B. Delfosse, Xavier Doyon, Rene Dumusque, Xavier Ehrenreich, David Hernandez, Jonay I. Gonzalez Lafreniere, David Leao, Izan de Castro Malo, Lison Melo, Claudio Mordasini, Christoph Pepe, Francesco Rebolo, Rafael De Medeiros, Jose Renan Rowe, Jason Santos, Nuno C. Segransan, Damien Mascareno, Alejandro Suarez Udry, Stephane Valencia, Diana Wade, Gregg Abreu, Manuel Aguiar, Jose L. A. Akinsanmi, Babatunde Allain, Guillaume Almenara, Jose Manuel Moulla, Khaled Al Arial, Tomy Auger, Hugues Bazinet, Luc Blind, Nicolas Boucher, Anne Broeg, Christopher Brousseau, Denis Cabral, Alexandre Challita, Zalpha Coelho, Joao Cointepas, Marion Silva, Ana Rita Costa Cristo, Eduardo Darveau-Bernier, Antoine Dauplaise, Laurie Gomes, Roseane de Lima de Freitas, Daniel Brito Fontinele, Dasaev O. Forveille, Thierry Frensch, Yolanda Gagne, Jonathan Genest, Frederic Temich, Felix Gracia Grieves, Nolan Hernandez, Olivier Hoeijmakers, Jens Hubin, Norbert Jahandar, Farbod Jayawardhana, Ray Kerley, Dan Kolb, Johann Krishnamurthy, Vigneshwaran L'Heureux, Alexandrine Lendl, Monika Lim, Olivia Curto, Gaspare Lo Matthews, Jaymie Martins, Allan M. Mayer, Jean-Sebastien Metchev, Stan Messias, Yuri S. Moranta, Leslie Mounzer, Dany Nari, Nicola Nielsen, Louise D. Osborn, Ares Parc, Lena Pasquini, Luca Pelletier, Stefan Peroux, Celine Piaulet, Caroline Plotnykov, Mykhaylo Pompei, Emanuela Poulin-Girard, Anne-Sophie Psaridi, Angelica Rasilla, Jose Luis Reshetov, Vladimir Saint-Antoine, Jonathan Sanz-Forcada, Jorge Seidel, Julia Saviane, Ivo da Silva, Joao Gomes Sosnowska, Danuta Srivastava, Avidaan Stefanov, Atanas K. Teixeira, Marcio A. Thibault, Simon Vallee, Philippe Vandal, Thomas Vaulato, Valentina Wardenier, Joost P. Wehbe, Bachar Weisserman, Drew Wildi, Francois Yariv, Vincent Zins, Gerard Earth and Planetary Astrophysics Near-infrared high-resolution echelle spectrographs unlock access to fundamental properties of exoplanets, from their atmospheric escape and composition to their orbital architecture, which can all be studied simultaneously from transit observations. We present the first results of the newly commissioned ESO near-infrared spectrograph, NIRPS, from three transits of WASP-69b. We used the RM Revolutions technique to better constrain the orbital architecture of the system. We extracted the high-resolution helium absorption profile to study its spectral shape and temporal variations. Then, we made 3D simulations from the EVE code to fit the helium absorption time series. We measure a slightly misaligned orbit for WASP-69b (psi of 28.7+/-5.7 deg). We confirm the detection of helium with an average excess absorption of 3.17+/-0.05%. The helium absorption is spectrally and temporally resolved, extends to high altitudes and has a strong velocity shift up to -29.5+/-2.5 km/s 50 minutes after egress. EVE simulations put constraints on the mass loss of 2.25 10^11 g/s and hint at reactive chemistry within the cometary-like tail and interaction with the stellar winds that allow the metastable helium to survive longer than expected. Our results suggest that WASP-69b is undergoing a transformative phase in its history, losing mass while evolving on a misaligned orbit. This work shows how combining multiple observational tracers such as orbital architecture, atmospheric escape, and composition, is critical to understand exoplanet demographics and their formation and evolution. We demonstrate that NIRPS can reach precisions similar to HARPS for RM studies, and the high data quality of NIRPS leads to unprecedented atmospheric characterization. The high stability of NIRPS combined with the large GTO available for its consortium, enables in-depth studies of exoplanets as well as large population surveys.
title	NIRPS detection of delayed atmospheric escape from the warm and misaligned Saturn-mass exoplanet WASP-69b
topic	Earth and Planetary Astrophysics
url	https://arxiv.org/abs/2507.21284

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