2023Sci...382.1031S

Query : 2023Sci...382.1031S

2023Sci...382.1031S - Science, 382, 1031-1035 (2023/December-0)

A Neptune-mass exoplanet in close orbit around a very low-mass star challenges formation models.

STEFANSSON G., MAHADEVAN S., MIGUEL Y., ROBERTSON P., DELAMER M., KANODIA S., CANAS C.I., WINN J.N., NINAN J.P., TERRIEN R.C., HOLCOMB R., FORD E.B., ZAWADZKI B., BOWLER B.P., BENDER C.F., COCHRAN W.D., DIDDAMS S., ENDL M., FREDRICK C., HALVERSON S., HEARTY F., HILL G.J., LIN A.S.J., METCALF A.J., MONSON A., RAMSEY L., ROY A., SCHWAB C., WRIGHT J.T. and ZEIMANN G.

Abstract (from CDS):

Theories of planet formation predict that low-mass stars should rarely host exoplanets with masses exceeding that of Neptune. We used radial velocity observations to detect a Neptune-mass exoplanet orbiting LHS 3154, a star that is nine times less massive than the Sun. The exoplanet's orbital period is 3.7 days, and its minimum mass is 13.2 Earth masses. We used simulations to show that the high planet-to-star mass ratio (>3.5 × 10-4) is not an expected outcome of either the core accretion or gravitational instability theories of planet formation. In the core-accretion simulations, we show that close-in Neptune-mass planets are only formed if the dust mass of the protoplanetary disk is an order of magnitude greater than typically observed around very low-mass stars.

Abstract Copyright: © 2023 American Association for the Advancement of Science. All rights reserved. AAAS is a partner of HINARI, AGORA, OARE, CHORUS, CLOCKSS, CrossRef and COUNTER.

Journal keyword(s):

VizieR on-line data: <Available at CDS (J/other/Sci/382.1031): tables1.dat tables2.dat>

Simbad objects: 12

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Number of rows : 12
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 NAME G 268-38b Pl 00 44 59.3309137511 -15 16 17.542839990           ~ 237 0
2 GJ 9066 b Pl? 02 00 12.9563198327 +13 03 07.000569241           ~ 10 0
3 NAME Teegarden's Star LM* 02 53 00.8917932409 +16 52 52.632190137   17.21 15.14 13.03 10.65 dM6 207 0
4 NAME Teegarden's Star b Pl 02 53 00.8917932409 +16 52 52.632190137           ~ 37 0
5 NAME G 234-45b Pl 08 41 20.1286588424 +59 29 50.444062516           ~ 37 0
6 LP 224-38 PM* 16 06 33.7947592274 +40 54 22.040789471   18.8   16.3   M6Ve 32 0
7 NAME LP 224-38b Pl 16 06 33.7947592274 +40 54 22.040789471           ~ 3 0
8 NAME G 139-21b Pl 17 15 18.9339850845 +04 57 50.066612336           ~ 845 1
9 NAME L 788-37b Pl 22 13 42.8631007040 -17 41 08.670606651           ~ 9 0
10 TRAPPIST-1b Pl 23 06 29.3684948589 -05 02 29.037301866           ~ 380 0
11 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0
12 TRAPPIST-1g Pl 23 06 29.3684948589 -05 02 29.037301866           ~ 237 0

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