Searching for Neutral Hydrogen Escape from the 120 Myr Old Sub-Neptune HIP94235b using HST
Article
Huang, Chelsea X., Morrissey, Ava, Zhou, George, Wright, Duncan, Auger, Caitlin, Rockcliffe, Keighley E., Newton, Elisabeth R., Rogers, James G., Gibson, Neale, Lowson, Nataliea, Mayorga, L. C. and Wittenmyer, Robert A.. 2024. "Searching for Neutral Hydrogen Escape from the 120 Myr Old Sub-Neptune HIP94235b using HST." The Astronomical Journal. 168 (4). https://doi.org/10.3847/1538-3881/ad6a53
Article Title | Searching for Neutral Hydrogen Escape from the 120 Myr Old Sub-Neptune HIP94235b using HST |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Huang, Chelsea X., Morrissey, Ava, Zhou, George, Wright, Duncan, Auger, Caitlin, Rockcliffe, Keighley E., Newton, Elisabeth R., Rogers, James G., Gibson, Neale, Lowson, Nataliea, Mayorga, L. C. and Wittenmyer, Robert A. |
Journal Title | The Astronomical Journal |
Journal Citation | 168 (4) |
Number of Pages | 8 |
Year | 2024 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ad6a53 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ad6a53 |
Abstract | HIP94235 b, a 120 Myr old sub-Neptune, provides us the unique opportunity to study mass loss at a pivotal stage of the system's evolution: the end of a 100 Myr old phase of intense XUV irradiation. We present two observations of HIP94235 b using the Hubble Space Telescope's Space Telescope Imaging Spectrograph in the Lyα wavelength region. We do not observe discernible differences across either the blue and red wings of the Lyα line profile in and out of transit, and report no significant detection of outflowing neutral hydrogen around the planet. We constrain the rate of neutral hydrogen escaping HIP94235 b to an upper limit of 1013 gs−1, which remains consistent with energy-limited model predictions of 1011 gs−1. The Lyα nondetection is likely due to the extremely short photoionization timescale of the neutral hydrogen escaping the planet's atmosphere. This timescale, approximately 15 minutes, is significantly shorter than that of any other planets with STIS observations. Through energy-limited mass loss models, we anticipate that HIP94235 b will transition into a super-Earth within a timescale of 1 Gyr. |
Keywords | Exoplanet atmospheres |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Byline Affiliations | Centre for Astrophysics |
Dartmouth College, United States | |
University of California Los Angeles, United States | |
Trinity College, Ireland | |
Johns Hopkins University, United States |
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