Planetary Parameters, XUV Environments, and Mass-loss Rates for Nearby Gaseous Planets with X-Ray-detected Host Stars
We leverage Gaia DR2 parallactic distances to deliver new or revised estimates of planetary parameters and X-ray irradiation for a distance-limited (≲100 pc) sample of 27 gaseous planets (from super-Earths to hot Jupiters) with publicly available Chandra and/or XMM observations, for which we carry o...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astronomical Journal |
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| Online Access: | https://doi.org/10.3847/1538-3881/acc336 |
| _version_ | 1827826770215174144 |
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| author | Riccardo Spinelli Elena Gallo Francesco Haardt Andrea Caldiroli Federico Biassoni Francesco Borsa Emily Rauscher |
| author_facet | Riccardo Spinelli Elena Gallo Francesco Haardt Andrea Caldiroli Federico Biassoni Francesco Borsa Emily Rauscher |
| author_sort | Riccardo Spinelli |
| collection | DOAJ |
| description | We leverage Gaia DR2 parallactic distances to deliver new or revised estimates of planetary parameters and X-ray irradiation for a distance-limited (≲100 pc) sample of 27 gaseous planets (from super-Earths to hot Jupiters) with publicly available Chandra and/or XMM observations, for which we carry out a homogeneous data reduction. For 20 planets with X-ray-detected host stars we make use of the photoionization hydrodynamics code ATES to derive updated atmospheric mass outflow rates. The newly derived masses/radii are not consistent with the exoplanet.eu values for five systems: HD 149026b and WASP-38, for mass, and Au Mic b, HAT-P-20, and HAT-P-2 for radii. Notably, the lower mass implies a (Saturn-like) density of 0.86 ± 0.09 g cm ^−3 for HD 149026b. This independent estimate is consistent with the lowest values reported in the literature. Separately, we report on the X-ray detection of GJ 9827, HD 219134, and LHS 1140 for the first time. The inferred stellar X-ray luminosity of LHS 1140 ( ${1.34}_{-0.21}^{+0.19}\times {10}^{26}$ erg s ^−1 ) implies that LHS 1140 b is the least irradiated transiting super-Earth known to orbit within the habitable zone of a nearby M dwarf. |
| first_indexed | 2024-03-12T03:17:08Z |
| format | Article |
| id | doaj.art-8cd6f3b804fe4eae8e68cccaa82fa41b |
| institution | Directory Open Access Journal |
| issn | 1538-3881 |
| language | English |
| last_indexed | 2024-03-12T03:17:08Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj.art-8cd6f3b804fe4eae8e68cccaa82fa41b2023-09-03T14:08:27ZengIOP PublishingThe Astronomical Journal1538-38812023-01-01165520010.3847/1538-3881/acc336Planetary Parameters, XUV Environments, and Mass-loss Rates for Nearby Gaseous Planets with X-Ray-detected Host StarsRiccardo Spinelli0Elena Gallo1https://orcid.org/0000-0001-5802-6041Francesco Haardt2https://orcid.org/0000-0003-3291-3704Andrea Caldiroli3Federico Biassoni4Francesco Borsa5https://orcid.org/0000-0003-4830-0590Emily Rauscher6https://orcid.org/0000-0003-3963-9672Dipartimento di Scienza e Alta Tecnologia, Università degli Studi dell’Insubria , via Valleggio 11, I-22100 Como, Italy; INAF—Osservatorio Astronomico di Brera , Via E. Bianchi 46, I-23807 Merate, ItalyDepartment of Astronomy, University of Michigan, 1085 S University , Ann Arbor, MI 48109, USA ; egallo@umich.eduDipartimento di Scienza e Alta Tecnologia, Università degli Studi dell’Insubria , via Valleggio 11, I-22100 Como, Italy; INAF—Osservatorio Astronomico di Brera , Via E. Bianchi 46, I-23807 Merate, Italy; INFN, Sezione Milano-Bicocca,P.za della Scienza 3, I-20126 Milano, ItalyFakultät für Mathematik, Universität Wien , Oskar-Morgenstern-Platz 1, A-1090 Wien, AustriaDipartimento di Scienza e Alta Tecnologia, Università degli Studi dell’Insubria , via Valleggio 11, I-22100 Como, Italy; INAF—Osservatorio Astronomico di Brera , Via E. Bianchi 46, I-23807 Merate, ItalyINAF—Osservatorio Astronomico di Brera , Via E. Bianchi 46, I-23807 Merate, ItalyDepartment of Astronomy, University of Michigan, 1085 S University , Ann Arbor, MI 48109, USA ; egallo@umich.eduWe leverage Gaia DR2 parallactic distances to deliver new or revised estimates of planetary parameters and X-ray irradiation for a distance-limited (≲100 pc) sample of 27 gaseous planets (from super-Earths to hot Jupiters) with publicly available Chandra and/or XMM observations, for which we carry out a homogeneous data reduction. For 20 planets with X-ray-detected host stars we make use of the photoionization hydrodynamics code ATES to derive updated atmospheric mass outflow rates. The newly derived masses/radii are not consistent with the exoplanet.eu values for five systems: HD 149026b and WASP-38, for mass, and Au Mic b, HAT-P-20, and HAT-P-2 for radii. Notably, the lower mass implies a (Saturn-like) density of 0.86 ± 0.09 g cm ^−3 for HD 149026b. This independent estimate is consistent with the lowest values reported in the literature. Separately, we report on the X-ray detection of GJ 9827, HD 219134, and LHS 1140 for the first time. The inferred stellar X-ray luminosity of LHS 1140 ( ${1.34}_{-0.21}^{+0.19}\times {10}^{26}$ erg s ^−1 ) implies that LHS 1140 b is the least irradiated transiting super-Earth known to orbit within the habitable zone of a nearby M dwarf.https://doi.org/10.3847/1538-3881/acc336ExoplanetsStar-planet interactionsExoplanet atmospheric evolution |
| spellingShingle | Riccardo Spinelli Elena Gallo Francesco Haardt Andrea Caldiroli Federico Biassoni Francesco Borsa Emily Rauscher Planetary Parameters, XUV Environments, and Mass-loss Rates for Nearby Gaseous Planets with X-Ray-detected Host Stars The Astronomical Journal Exoplanets Star-planet interactions Exoplanet atmospheric evolution |
| title | Planetary Parameters, XUV Environments, and Mass-loss Rates for Nearby Gaseous Planets with X-Ray-detected Host Stars |
| title_full | Planetary Parameters, XUV Environments, and Mass-loss Rates for Nearby Gaseous Planets with X-Ray-detected Host Stars |
| title_fullStr | Planetary Parameters, XUV Environments, and Mass-loss Rates for Nearby Gaseous Planets with X-Ray-detected Host Stars |
| title_full_unstemmed | Planetary Parameters, XUV Environments, and Mass-loss Rates for Nearby Gaseous Planets with X-Ray-detected Host Stars |
| title_short | Planetary Parameters, XUV Environments, and Mass-loss Rates for Nearby Gaseous Planets with X-Ray-detected Host Stars |
| title_sort | planetary parameters xuv environments and mass loss rates for nearby gaseous planets with x ray detected host stars |
| topic | Exoplanets Star-planet interactions Exoplanet atmospheric evolution |
| url | https://doi.org/10.3847/1538-3881/acc336 |
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