2023AJ....166..181Y

Query : 2023AJ....166..181Y

2023AJ....166..181Y - Astron. J., 166, 181 (2023/November-0)

TESS Spots a Super-puff: The Remarkably Low Density of TOI-1420b.

YOSHIDA S., VISSAPRAGADA S., LATHAM D.W., BIERYLA A., THORNGREN D.P., EASTMAN J.D., LOPEZ-MORALES M., BARKAOUI K., BEICHMAN C., BERLIND P., BUCHAVE L.A., CALKINS M.L., CIARDI D.R., COLLINS K.A., COSENTINO R., CROSSFIELD I.J.M., DAI F., DITOMASSO V., DOWLING N., ESQUERDO G.A., FORES-TORIBIO R., GHEDINA A., GOLIGUZOVA M.V., GOLUB E., GONZALES E.J., HORTA F.G., HIGUERA J., HOCH N., HORNE K., HOWELL S.B., JENKINS J.M., KLUSMEYER J., LALOUM D., LISSAUER J.J., LOGSDON S.E., MALAVOLTA L., MATSON R.A., MATTHEWS E.C., McLEOD K.K., MEDINA J.V., MUNOZ J.A., OSBORN H.P., SAFONOV B., SCHLIEDER J., SCHMIDT M., SCHWEIKER H., SEAGER S., SOZZETTI A., SRDOC G., STEFANSSON G., STRAKHOV I.A., STRIEGEL S., VILLASENOR J. and WINN J.N.

Abstract (from CDS):

We present the discovery of TOI-1420b, an exceptionally low-density (ρ = 0.08 ± 0.02 g cm–3) transiting planet in a P = 6.96 days orbit around a late G-dwarf star. Using transit observations from TESS, LCOGT, Observatoire Privé 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⊕ and a mass of Mp = 25.1 ± 3.8M⊕. TOI-1420b is the largest known planet with a mass less than 50M⊕, indicating that it contains a sizeable envelope of hydrogen and helium. We determine TOI-1420b's envelope mass fraction to be ${f}_{\mathrm{env}}={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 1950 km, a transmission spectroscopy metric of 580, and a predicted Rossiter-McLaughlin amplitude of about 17 m s–1, TOI-1420b is an excellent target for future atmospheric and dynamical characterization.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanets - Transits - Exoplanet structure

VizieR on-line data: <Available at CDS (J/AJ/166/181): table3.dat>

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 BD-03 2978b Pl 10 42 14.0836906368 -03 50 06.260144388           ~ 150 0
2 HD 93396b Pl 10 46 49.7401839144 -09 23 56.495447700           ~ 70 0
3 WASP-193b Pl 10 57 23.8521672360 -29 59 49.665809724           ~ 8 0
4 WASP-107b Pl 12 33 32.8441110816 -10 08 46.225572324           ~ 289 0
5 HD 189733b Pl 20 00 43.7129433648 +22 42 39.073143456           ~ 1610 1
6 BD-05 5432b Pl 21 00 06.1968214728 -05 05 40.034944176           ~ 219 1
7 TOI-1420b Pl 21 31 45.9170527584 +66 20 55.925292624           ~ 12 0
8 TOI-1420 PM* 21 31 45.9170527584 +66 20 55.925292624   12.55 11.65     ~ 11 0
9 HD 209458b Pl 22 03 10.7727465312 +18 53 03.549393384           ~ 2037 1

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