Inhomogeneous terminators on the exoplanet WASP-39 b
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| Format: | Preprint |
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2024
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| author | Espinoza, Néstor Steinrueck, Maria E. Kirk, James MacDonald, Ryan J. Savel, Arjun B. Arnold, Kenneth Kempton, Eliza M. -R. Murphy, Matthew M. Carone, Ludmila Zamyatina, Maria Lewis, David A. Samra, Dominic Kiefer, Sven Rauscher, Emily Christie, Duncan Mayne, Nathan Helling, Christiane Rustamkulov, Zafar Parmentier, Vivien May, Erin M. Carter, Aarynn L. Zhang, Xi López-Morales, Mercedes Allen, Natalie Blecic, Jasmina Decin, Leen Mancini, Luigi Molaverdikhani, Karan Rackham, Benjamin V. Palle, Enric Tsai, Shang-Min Ahrer, Eva-Maria Bean, Jacob L. Crossfield, Ian J. M. Haegele, David Hébrard, Eric Kreidberg, Laura Powell, Diana Schneider, Aaron D. Welbanks, Luis Wheatley, Peter Brahm, Rafael Crouzet, Nicolas |
| author_facet | Espinoza, Néstor Steinrueck, Maria E. Kirk, James MacDonald, Ryan J. Savel, Arjun B. Arnold, Kenneth Kempton, Eliza M. -R. Murphy, Matthew M. Carone, Ludmila Zamyatina, Maria Lewis, David A. Samra, Dominic Kiefer, Sven Rauscher, Emily Christie, Duncan Mayne, Nathan Helling, Christiane Rustamkulov, Zafar Parmentier, Vivien May, Erin M. Carter, Aarynn L. Zhang, Xi López-Morales, Mercedes Allen, Natalie Blecic, Jasmina Decin, Leen Mancini, Luigi Molaverdikhani, Karan Rackham, Benjamin V. Palle, Enric Tsai, Shang-Min Ahrer, Eva-Maria Bean, Jacob L. Crossfield, Ian J. M. Haegele, David Hébrard, Eric Kreidberg, Laura Powell, Diana Schneider, Aaron D. Welbanks, Luis Wheatley, Peter Brahm, Rafael Crouzet, Nicolas |
| contents | Transmission spectroscopy has been a workhorse technique over the past two decades to constrain the physical and chemical properties of exoplanet atmospheres. One of its classical key assumptions is that the portion of the atmosphere it probes -- the terminator region -- is homogeneous. Several works in the past decade, however, have put this into question for highly irradiated, hot ($T_{eq}\gtrsim 1000$ K) gas giant exoplanets both empirically and via 3-dimensional modelling. While models predict clear differences between the evening (day-to-night) and morning (night-to-day) terminators, direct morning/evening transmission spectra in a wide wavelength range has not been reported for an exoplanet to date. Under the assumption of precise and accurate orbital parameters on WASP-39 b, here we report the detection of inhomogeneous terminators on the exoplanet WASP-39 b, which allows us to retrieve its morning and evening transmission spectra in the near-infrared ($2-5\ μ$m) using JWST. We observe larger transit depths in the evening which are, on average, $405 \pm 88$ ppm larger than the morning ones, also having qualitatively larger features than the morning spectrum. The spectra are best explained by models in which the evening terminator is hotter than the morning terminator by $177^{+65}_{-57}$ K with both terminators having C/O ratios consistent with solar. General circulation models (GCMs) predict temperature differences broadly consistent with the above value and point towards a cloudy morning terminator and a clearer evening terminator. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_10294 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Inhomogeneous terminators on the exoplanet WASP-39 b Espinoza, Néstor Steinrueck, Maria E. Kirk, James MacDonald, Ryan J. Savel, Arjun B. Arnold, Kenneth Kempton, Eliza M. -R. Murphy, Matthew M. Carone, Ludmila Zamyatina, Maria Lewis, David A. Samra, Dominic Kiefer, Sven Rauscher, Emily Christie, Duncan Mayne, Nathan Helling, Christiane Rustamkulov, Zafar Parmentier, Vivien May, Erin M. Carter, Aarynn L. Zhang, Xi López-Morales, Mercedes Allen, Natalie Blecic, Jasmina Decin, Leen Mancini, Luigi Molaverdikhani, Karan Rackham, Benjamin V. Palle, Enric Tsai, Shang-Min Ahrer, Eva-Maria Bean, Jacob L. Crossfield, Ian J. M. Haegele, David Hébrard, Eric Kreidberg, Laura Powell, Diana Schneider, Aaron D. Welbanks, Luis Wheatley, Peter Brahm, Rafael Crouzet, Nicolas Earth and Planetary Astrophysics Transmission spectroscopy has been a workhorse technique over the past two decades to constrain the physical and chemical properties of exoplanet atmospheres. One of its classical key assumptions is that the portion of the atmosphere it probes -- the terminator region -- is homogeneous. Several works in the past decade, however, have put this into question for highly irradiated, hot ($T_{eq}\gtrsim 1000$ K) gas giant exoplanets both empirically and via 3-dimensional modelling. While models predict clear differences between the evening (day-to-night) and morning (night-to-day) terminators, direct morning/evening transmission spectra in a wide wavelength range has not been reported for an exoplanet to date. Under the assumption of precise and accurate orbital parameters on WASP-39 b, here we report the detection of inhomogeneous terminators on the exoplanet WASP-39 b, which allows us to retrieve its morning and evening transmission spectra in the near-infrared ($2-5\ μ$m) using JWST. We observe larger transit depths in the evening which are, on average, $405 \pm 88$ ppm larger than the morning ones, also having qualitatively larger features than the morning spectrum. The spectra are best explained by models in which the evening terminator is hotter than the morning terminator by $177^{+65}_{-57}$ K with both terminators having C/O ratios consistent with solar. General circulation models (GCMs) predict temperature differences broadly consistent with the above value and point towards a cloudy morning terminator and a clearer evening terminator. |
| title | Inhomogeneous terminators on the exoplanet WASP-39 b |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2407.10294 |