HARPS-N and NEID radial velocities of TOI-1420 Virtual Observatory Resource

Authors

1. Yoshida S.
2. Vissapragada S.
3. Latham D.W.
4. Bieryla A.
5. Thorngren D.P.,Eastman J.D.
6. Lopez-Morales M.
7. Barkaoui K.
8. Beichman C.
9. Berlind P.,Buchave L.A.
10. Calkins M.L.
11. Ciardi D.R.
12. Collins K.A.
13. Cosentino R.,Crossfield I.J.M.
14. Dai F.
15. DiTomasso V.
16. Dowling N.
17. Esquerdo G.A.,Fores-Toribio R.
18. Ghedina A.
19. Goliguzova M.V.
20. Golub E.
21. Gonzales E.J.,Horta F.G.
22. Higuera J.
23. Hoch N.
24. Horne K.
25. Howell S.B.
26. Jenkins J.M.,Klusmeyer J.
27. Laloum D.
28. Lissauer J.J.
29. Logsdon S.E.
30. Malavolta L.,Matson R.A.
31. Matthews E.C.
32. McLeod K.K.
33. Medina J.V.
34. Munoz J.A.,Osborn H.P.
35. Safonov B.
36. Schlieder J.
37. Schmidt M.
38. Schweiker H.,Seager S.
39. Sozzetti A.
40. Srdoc G.
41. Stefansson G.
42. Strakhov I.A.,Striegel S.
43. Villasenor J.
44. Winn J.N.

Published by

CDS

Abstract

We present the discovery of TOI-1420b, an exceptionally low-density ({rho}=0.08{+/-}0.02g/cm^3^) transiting planet in a P=6.96days orbit around a late G-dwarf star. Using transit observations from TESS, LCOGT, Observatoire Prive du Mont, Whitin, Wendelstein, OAUV, Ca l'Ou, and KeplerCam, along with radial velocity observations from HARPS-N and NEID, we find that the planet has a radius of Rp=11.9{+/-}0.3R{Earth} and a mass of Mp=25.1{+/-}3.8M{Earth}. TOI-1420b is the largest known planet with a mass less than 50M{Earth}, indicating that it contains a sizeable envelope of hydrogen and helium. We determine TOI-1420b's envelope mass fraction to be f~=82_-6_^+7^% , suggesting that runaway gas accretion occurred when its core was at most four to five times the mass of the Earth. TOI-1420b is similar to the planet WASP-107b in mass, radius, density, and orbital period, so a comparison of these two systems may help reveal the origins of close-in low-density planets. With an atmospheric scale height of 1950km, a transmission spectroscopy metric of 580, and a predicted Rossiter-McLaughlin amplitude of about 17m/s, TOI-1420b is an excellent target for future atmospheric and dynamical characterization.

Keywords

1. exoplanets
2. g-stars
3. visible-astronomy
4. spectroscopy
5. radial-velocity

Bibliographic source Bibcode

2023AJ....166..181Y

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