The metal-poor atmosphere of a Neptune/Sub-Neptune planet progenitor
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866909196484608000 |
|---|---|
| author | Barat, Saugata Désert, Jean-Michel Vazan, Allona Baeyens, Robin Line, Michael R. Fortney, Jonathan J. David, Trevor J. Livingston, John H. Jacobs, Bob Panwar, Vatsal Shivkumar, Hinna Todorov, Kamen O. Pino, Lorenzo Mraz, Georgia Petigura, Erik A. |
| author_facet | Barat, Saugata Désert, Jean-Michel Vazan, Allona Baeyens, Robin Line, Michael R. Fortney, Jonathan J. David, Trevor J. Livingston, John H. Jacobs, Bob Panwar, Vatsal Shivkumar, Hinna Todorov, Kamen O. Pino, Lorenzo Mraz, Georgia Petigura, Erik A. |
| contents | Young transiting exoplanets offer a unique opportunity to characterize the atmospheres of fresh and evolving products of planet formation. We present the transmission spectrum of V1298 Tau b; a 23 Myr old warm Jovian sized planet orbiting a pre-main sequence star. We detect a primordial atmosphere with an exceptionally large atmospheric scale height and a water vapour absorption at 5$σ$ level of significance. We estimate a mass and density upper limit (24$\pm$5$M_{\oplus}$, 0.12gm/$cm^{3}$ respectively). V1298 Tau b is one of the lowest density planets discovered till date. We retrieve a low atmospheric metallicity (logZ=$-0.1^{+0.66}_{-0.72}$ solar), consistent with solar/sub-solar values. Our findings challenge the expected mass-metallicity from core-accretion theory. Our observations can be explained by in-situ formation via pebble accretion together with ongoing evolutionary mechanisms. We do not detect methane, which hints towards a hotter than expected interior from just the formation entropy of this planet. Our observations suggest that V1298 Tau b is likely to evolve into a Neptune/sub-Neptune type of planet. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_16924 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The metal-poor atmosphere of a Neptune/Sub-Neptune planet progenitor Barat, Saugata Désert, Jean-Michel Vazan, Allona Baeyens, Robin Line, Michael R. Fortney, Jonathan J. David, Trevor J. Livingston, John H. Jacobs, Bob Panwar, Vatsal Shivkumar, Hinna Todorov, Kamen O. Pino, Lorenzo Mraz, Georgia Petigura, Erik A. Earth and Planetary Astrophysics Young transiting exoplanets offer a unique opportunity to characterize the atmospheres of fresh and evolving products of planet formation. We present the transmission spectrum of V1298 Tau b; a 23 Myr old warm Jovian sized planet orbiting a pre-main sequence star. We detect a primordial atmosphere with an exceptionally large atmospheric scale height and a water vapour absorption at 5$σ$ level of significance. We estimate a mass and density upper limit (24$\pm$5$M_{\oplus}$, 0.12gm/$cm^{3}$ respectively). V1298 Tau b is one of the lowest density planets discovered till date. We retrieve a low atmospheric metallicity (logZ=$-0.1^{+0.66}_{-0.72}$ solar), consistent with solar/sub-solar values. Our findings challenge the expected mass-metallicity from core-accretion theory. Our observations can be explained by in-situ formation via pebble accretion together with ongoing evolutionary mechanisms. We do not detect methane, which hints towards a hotter than expected interior from just the formation entropy of this planet. Our observations suggest that V1298 Tau b is likely to evolve into a Neptune/sub-Neptune type of planet. |
| title | The metal-poor atmosphere of a Neptune/Sub-Neptune planet progenitor |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2312.16924 |