GJ 3090 b: one of the most favourable mini-Neptune for atmospheric characterisation
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2022
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866915383444766720 |
|---|---|
| author | Almenara, J. M. Bonfils, X. Otegi, J. F. Attia, M. Turbet, M. Astudillo-Defru, N. Collins, K. A. Polanski, A. S. Bourrier, V. Hellier, C. Ziegler, C. Bouchy, F. Briceño, C. Charbonneau, D. Cointepas, M. Collins, K. I. Crossfield, I. Delfosse, X. Díaz, R. F. Dorn, C. Doty, J. P. Forveille, T. Gaisné, G. Gan, T. Helled, R. Hesse, K. Jenkins, J. M. Jensen, E. L. N. Latham, D. W. Law, N. Mann, A. W. Mao, S. McLean, B. Murgas, F. Myers, G. Seager, S. Shporer, A. Tan, T. G. Twicken, J. D. Winn, J. |
| author_facet | Almenara, J. M. Bonfils, X. Otegi, J. F. Attia, M. Turbet, M. Astudillo-Defru, N. Collins, K. A. Polanski, A. S. Bourrier, V. Hellier, C. Ziegler, C. Bouchy, F. Briceño, C. Charbonneau, D. Cointepas, M. Collins, K. I. Crossfield, I. Delfosse, X. Díaz, R. F. Dorn, C. Doty, J. P. Forveille, T. Gaisné, G. Gan, T. Helled, R. Hesse, K. Jenkins, J. M. Jensen, E. L. N. Latham, D. W. Law, N. Mann, A. W. Mao, S. McLean, B. Murgas, F. Myers, G. Seager, S. Shporer, A. Tan, T. G. Twicken, J. D. Winn, J. |
| contents | We report the detection of GJ 3090 b (TOI-177.01), a mini-Neptune on a 2.9-day orbit transiting a bright (K = 7.3 mag) M2 dwarf located at 22 pc. The planet was identified by the Transiting Exoplanet Survey Satellite and was confirmed with the High Accuracy Radial velocity Planet Searcher radial velocities. Seeing-limited photometry and speckle imaging rule out nearby eclipsing binaries. Additional transits were observed with the LCOGT, Spitzer, and ExTrA telescopes. We characterise the star to have a mass of 0.519 $\pm$ 0.013 M$_\odot$ and a radius of 0.516 $\pm$ 0.016 R$_\odot$. We modelled the transit light curves and radial velocity measurements and obtained a planetary mass of 3.34 $\pm$ 0.72 M$_\oplus$, a radius of 2.13 $\pm$ 0.11 R$_\oplus$, and a mean density of 1.89$^{+0.52}_{-0.45}$ g/cm$^3$. The low density of the planet implies the presence of volatiles, and its radius and insolation place it immediately above the radius valley at the lower end of the mini-Neptune cluster. A coupled atmospheric and dynamical evolution analysis of the planet is inconsistent with a pure H-He atmosphere and favours a heavy mean molecular weight atmosphere. The transmission spectroscopy metric of 221$^{+66}_{-46}$ means that GJ 3090 b is the second or third most favourable mini-Neptune after GJ 1214 b whose atmosphere may be characterised. At almost half the mass of GJ 1214 b, GJ 3090 b is an excellent probe of the edge of the transition between super-Earths and mini-Neptunes. We identify an additional signal in the radial velocity data that we attribute to a planet candidate with an orbital period of 13 days and a mass of 17.1$^{+8.9}_{-3.2}$ M$_\oplus$, whose transits are not detected. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2207_14121 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | GJ 3090 b: one of the most favourable mini-Neptune for atmospheric characterisation Almenara, J. M. Bonfils, X. Otegi, J. F. Attia, M. Turbet, M. Astudillo-Defru, N. Collins, K. A. Polanski, A. S. Bourrier, V. Hellier, C. Ziegler, C. Bouchy, F. Briceño, C. Charbonneau, D. Cointepas, M. Collins, K. I. Crossfield, I. Delfosse, X. Díaz, R. F. Dorn, C. Doty, J. P. Forveille, T. Gaisné, G. Gan, T. Helled, R. Hesse, K. Jenkins, J. M. Jensen, E. L. N. Latham, D. W. Law, N. Mann, A. W. Mao, S. McLean, B. Murgas, F. Myers, G. Seager, S. Shporer, A. Tan, T. G. Twicken, J. D. Winn, J. Earth and Planetary Astrophysics We report the detection of GJ 3090 b (TOI-177.01), a mini-Neptune on a 2.9-day orbit transiting a bright (K = 7.3 mag) M2 dwarf located at 22 pc. The planet was identified by the Transiting Exoplanet Survey Satellite and was confirmed with the High Accuracy Radial velocity Planet Searcher radial velocities. Seeing-limited photometry and speckle imaging rule out nearby eclipsing binaries. Additional transits were observed with the LCOGT, Spitzer, and ExTrA telescopes. We characterise the star to have a mass of 0.519 $\pm$ 0.013 M$_\odot$ and a radius of 0.516 $\pm$ 0.016 R$_\odot$. We modelled the transit light curves and radial velocity measurements and obtained a planetary mass of 3.34 $\pm$ 0.72 M$_\oplus$, a radius of 2.13 $\pm$ 0.11 R$_\oplus$, and a mean density of 1.89$^{+0.52}_{-0.45}$ g/cm$^3$. The low density of the planet implies the presence of volatiles, and its radius and insolation place it immediately above the radius valley at the lower end of the mini-Neptune cluster. A coupled atmospheric and dynamical evolution analysis of the planet is inconsistent with a pure H-He atmosphere and favours a heavy mean molecular weight atmosphere. The transmission spectroscopy metric of 221$^{+66}_{-46}$ means that GJ 3090 b is the second or third most favourable mini-Neptune after GJ 1214 b whose atmosphere may be characterised. At almost half the mass of GJ 1214 b, GJ 3090 b is an excellent probe of the edge of the transition between super-Earths and mini-Neptunes. We identify an additional signal in the radial velocity data that we attribute to a planet candidate with an orbital period of 13 days and a mass of 17.1$^{+8.9}_{-3.2}$ M$_\oplus$, whose transits are not detected. |
| title | GJ 3090 b: one of the most favourable mini-Neptune for atmospheric characterisation |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2207.14121 |