FUV flux of nearby exoplanet host stars in the Ariel target list

Sudeshna Boro Saikia; Stefano Bellotti; Andrea Bocchieri; Sarah Casewell; Billy Edwards; Luca Fossati; A. García Muñoz; Manuel Güdel; Franz Kerschbaum; Kristina Kislyakova; Theresa Lueftinger; Antonio Maggio; Yamila Miguel; Lorenzo. V. Mugnai; Ignazio Pillitteri; Donna Rodgers-Lee; Simon Schleich; Giovanna Tinetti; Gwenael Van Looveren; Olivia Venot; Krisztián Vida; A. A. Vidotto; Jiri Zak

FUV flux of nearby exoplanet host stars in the Ariel target list

Sudeshna Boro Saikia, Stefano Bellotti, Andrea Bocchieri, Sarah Casewell, Billy Edwards, Luca Fossati, A. García Muñoz, Manuel Güdel, Franz Kerschbaum, Kristina Kislyakova, Theresa Lueftinger, Antonio Maggio, Yamila Miguel, Lorenzo. V. Mugnai, Ignazio Pillitteri, Donna Rodgers-Lee, Simon Schleich, Giovanna Tinetti, Gwenael Van Looveren, Olivia VenotKrisztián Vida, A. A. Vidotto, Jiri Zak

Department of Astrophysics

Publications: Other publication › Other

Abstract

Stellar extreme ultraviolet (EUV) radiation drives atmospheric photochemistry and loss in orbiting planets. Hence, knowledge of EUV fluxes of exoplanet host stars is essential in the interpretation of exoplanet transmission spectra, as shown by the recent discovery of SO2 in gaseous exoplanets observed by JWST. In the absence of an instrument observing in the EUV wavelength and the known problem of instellar absorption in this wavelength range, far ultraviolet (FUV) flux acts as a proxy for the EUV flux.

We aim to estimate the EUV flux of a volume-limited sample of Ariel target stars within 100 pc from FUV spectra taken by HST/COS in the G140L grating. Planned to be launched in five years (2029), the Ariel mission will carry out transit and eclipse spectroscopy of ~1000 exoplanets and determine their atmospheric chemical abundances. The Ariel target list contains 154 exoplanet host stars within 100 pc out of which 17 have prior FUV data. We ask for a snapshot survey of the remaining 137 Ariel targets for which no FUV spectra exist.

Our sample is divided into three groups, with the top priority given to common Ariel and JWST targets, followed by high-priority and medium-to-low priority Ariel targets. The estimated EUV fluxes will be used as input in atmospheric photochemical models and in the target refinement of Ariel. The results will also be useful to the community in future JWST proposal preparations. Since snapshot programmes do not guarantee observations of all 137 targets, a completion rate of 13% (17 new stellar spectra) will double the current archival sample. This will enable us to perform a robust statistical analysis on the combined new and archival data.

Original language	English
Type	HST Proposal. Cycle 32, ID. #17794
Publication status	Published - Jul 2024

Austrian Fields of Science 2012

103003 Astronomy
103004 Astrophysics

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https://ui.adsabs.harvard.edu/abs/2024hst..prop17794B/abstract

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Boro Saikia, S., Bellotti, S., Bocchieri, A., Casewell, S., Edwards, B., Fossati, L., Muñoz, A. G., Güdel, M., Kerschbaum, F., Kislyakova, K., Lueftinger, T., Maggio, A., Miguel, Y., Mugnai, L. V., Pillitteri, I., Rodgers-Lee, D., Schleich, S., Tinetti, G., Van Looveren, G., ... Zak, J. (2024, Jul). FUV flux of nearby exoplanet host stars in the Ariel target list. https://ui.adsabs.harvard.edu/abs/2024hst..prop17794B/abstract

@misc{92c7d71a004b42859d8a6f736fa74be7,

title = "FUV flux of nearby exoplanet host stars in the Ariel target list",

abstract = "Stellar extreme ultraviolet (EUV) radiation drives atmospheric photochemistry and loss in orbiting planets. Hence, knowledge of EUV fluxes of exoplanet host stars is essential in the interpretation of exoplanet transmission spectra, as shown by the recent discovery of SO2 in gaseous exoplanets observed by JWST. In the absence of an instrument observing in the EUV wavelength and the known problem of instellar absorption in this wavelength range, far ultraviolet (FUV) flux acts as a proxy for the EUV flux.We aim to estimate the EUV flux of a volume-limited sample of Ariel target stars within 100 pc from FUV spectra taken by HST/COS in the G140L grating. Planned to be launched in five years (2029), the Ariel mission will carry out transit and eclipse spectroscopy of ~1000 exoplanets and determine their atmospheric chemical abundances. The Ariel target list contains 154 exoplanet host stars within 100 pc out of which 17 have prior FUV data. We ask for a snapshot survey of the remaining 137 Ariel targets for which no FUV spectra exist.Our sample is divided into three groups, with the top priority given to common Ariel and JWST targets, followed by high-priority and medium-to-low priority Ariel targets. The estimated EUV fluxes will be used as input in atmospheric photochemical models and in the target refinement of Ariel. The results will also be useful to the community in future JWST proposal preparations. Since snapshot programmes do not guarantee observations of all 137 targets, a completion rate of 13% (17 new stellar spectra) will double the current archival sample. This will enable us to perform a robust statistical analysis on the combined new and archival data. ",

author = "{Boro Saikia}, Sudeshna and Stefano Bellotti and Andrea Bocchieri and Sarah Casewell and Billy Edwards and Luca Fossati and Mu{\~n}oz, {A. Garc{\'i}a} and Manuel G{\"u}del and Franz Kerschbaum and Kristina Kislyakova and Theresa Lueftinger and Antonio Maggio and Yamila Miguel and Mugnai, {Lorenzo. V.} and Ignazio Pillitteri and Donna Rodgers-Lee and Simon Schleich and Giovanna Tinetti and {Van Looveren}, Gwenael and Olivia Venot and Kriszti{\'a}n Vida and Vidotto, {A. A.} and Jiri Zak",

year = "2024",

month = jul,

language = "English",

type = "Other",

}

Boro Saikia, S, Bellotti, S, Bocchieri, A, Casewell, S, Edwards, B, Fossati, L, Muñoz, AG, Güdel, M , Kerschbaum, F , Kislyakova, K, Lueftinger, T, Maggio, A, Miguel, Y, Mugnai, LV, Pillitteri, I, Rodgers-Lee, D, Schleich, S, Tinetti, G, Van Looveren, G, Venot, O, Vida, K, Vidotto, AA & Zak, J 2024, FUV flux of nearby exoplanet host stars in the Ariel target list.. <https://ui.adsabs.harvard.edu/abs/2024hst..prop17794B/abstract>

TY - GEN

T1 - FUV flux of nearby exoplanet host stars in the Ariel target list

AU - Boro Saikia, Sudeshna

AU - Bellotti, Stefano

AU - Bocchieri, Andrea

AU - Casewell, Sarah

AU - Edwards, Billy

AU - Fossati, Luca

AU - Muñoz, A. García

AU - Güdel, Manuel

AU - Kerschbaum, Franz

AU - Kislyakova, Kristina

AU - Lueftinger, Theresa

AU - Maggio, Antonio

AU - Miguel, Yamila

AU - Mugnai, Lorenzo. V.

AU - Pillitteri, Ignazio

AU - Rodgers-Lee, Donna

AU - Schleich, Simon

AU - Tinetti, Giovanna

AU - Van Looveren, Gwenael

AU - Venot, Olivia

AU - Vida, Krisztián

AU - Vidotto, A. A.

AU - Zak, Jiri

PY - 2024/7

Y1 - 2024/7

N2 - Stellar extreme ultraviolet (EUV) radiation drives atmospheric photochemistry and loss in orbiting planets. Hence, knowledge of EUV fluxes of exoplanet host stars is essential in the interpretation of exoplanet transmission spectra, as shown by the recent discovery of SO2 in gaseous exoplanets observed by JWST. In the absence of an instrument observing in the EUV wavelength and the known problem of instellar absorption in this wavelength range, far ultraviolet (FUV) flux acts as a proxy for the EUV flux.We aim to estimate the EUV flux of a volume-limited sample of Ariel target stars within 100 pc from FUV spectra taken by HST/COS in the G140L grating. Planned to be launched in five years (2029), the Ariel mission will carry out transit and eclipse spectroscopy of ~1000 exoplanets and determine their atmospheric chemical abundances. The Ariel target list contains 154 exoplanet host stars within 100 pc out of which 17 have prior FUV data. We ask for a snapshot survey of the remaining 137 Ariel targets for which no FUV spectra exist.Our sample is divided into three groups, with the top priority given to common Ariel and JWST targets, followed by high-priority and medium-to-low priority Ariel targets. The estimated EUV fluxes will be used as input in atmospheric photochemical models and in the target refinement of Ariel. The results will also be useful to the community in future JWST proposal preparations. Since snapshot programmes do not guarantee observations of all 137 targets, a completion rate of 13% (17 new stellar spectra) will double the current archival sample. This will enable us to perform a robust statistical analysis on the combined new and archival data.

AB - Stellar extreme ultraviolet (EUV) radiation drives atmospheric photochemistry and loss in orbiting planets. Hence, knowledge of EUV fluxes of exoplanet host stars is essential in the interpretation of exoplanet transmission spectra, as shown by the recent discovery of SO2 in gaseous exoplanets observed by JWST. In the absence of an instrument observing in the EUV wavelength and the known problem of instellar absorption in this wavelength range, far ultraviolet (FUV) flux acts as a proxy for the EUV flux.We aim to estimate the EUV flux of a volume-limited sample of Ariel target stars within 100 pc from FUV spectra taken by HST/COS in the G140L grating. Planned to be launched in five years (2029), the Ariel mission will carry out transit and eclipse spectroscopy of ~1000 exoplanets and determine their atmospheric chemical abundances. The Ariel target list contains 154 exoplanet host stars within 100 pc out of which 17 have prior FUV data. We ask for a snapshot survey of the remaining 137 Ariel targets for which no FUV spectra exist.Our sample is divided into three groups, with the top priority given to common Ariel and JWST targets, followed by high-priority and medium-to-low priority Ariel targets. The estimated EUV fluxes will be used as input in atmospheric photochemical models and in the target refinement of Ariel. The results will also be useful to the community in future JWST proposal preparations. Since snapshot programmes do not guarantee observations of all 137 targets, a completion rate of 13% (17 new stellar spectra) will double the current archival sample. This will enable us to perform a robust statistical analysis on the combined new and archival data.

M3 - Other

ER -

FUV flux of nearby exoplanet host stars in the Ariel target list

Abstract

Austrian Fields of Science 2012

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