2020AJ....160...96T

Query : 2020AJ....160...96T

2020AJ....160...96T - Astron. J., 160, 96-96 (2020/August-0)

TESS reveals a short-period sub-Neptune sibling (HD 86226c) to a known long-period giant planet.

TESKE J., DIAZ M.R., LUQUE R., MOCNIK T., SEIDEL J.V., OTEGI J.F., FENG F., JENKINS J.S., PALLE E., SEGRANSAN D., UDRY S., COLLINS K.A., EASTMAN J.D., RICKER G.R., VANDERSPEK R., LATHAM D.W., SEAGER S., WINN J.N., JENKINS J.M., ANDERSON D.R., BARCLAY T., BOUCHY F., BURT J.A., BUTLER R.P., CALDWELL D.A., COLLINS K.I., CRANE J.D., DORN C., FLOWERS E., HALDEMANN J., HELLED R., HELLIER C., JENSEN E.L.N., KANE S.R., LAW N., LISSAUER J.J., MANN A.W., MARMIER M., NIELSEN L.D., ROSE M.E., SHECTMAN S.A., SHPORER A., TORRES G., WANG S.X., WOLFGANG A., WONG I. and ZIEGLER C.

Abstract (from CDS):

The Transiting Exoplanet Survey Satellite mission was designed to find transiting planets around bright, nearby stars. Here, we present the detection and mass measurement of a small, short-period (≃4 days) transiting planet around the bright (V = 7.9), solar-type star HD 86226 (TOI-652, TIC 22221375), previously known to host a long-period (∼1600 days) giant planet. HD 86226c (TOI-652.01) has a radius of 2.16 ± 0.08 R⊕ and a mass of 7.25–1.12+1.19M⊕, based on archival and new radial velocity data. We also update the parameters of the longer-period, not-known-to-transit planet, and find it to be less eccentric and less massive than previously reported. The density of the transiting planet is 3.97 g cm–3, which is low enough to suggest that the planet has at least a small volatile envelope, but the mass fractions of rock, iron, and water are not well-constrained. Given the host star brightness, planet period, and location of the planet near both the "radius gap" and the "hot Neptune desert," HD 86226c is an interesting candidate for transmission spectroscopy to further refine its composition.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Exoplanet astronomy - Exoplanet systems

VizieR on-line data: <Available at CDS (J/AJ/160/96): table2.dat table3.dat>

Simbad objects: 14

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Number of rows : 14
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 * pi. Men c Pl 05 37 09.8868446714 -80 28 08.834553264           ~ 117 0
2 NAME LP 424-4b Pl 07 59 05.8395356736 +15 23 29.236065000           ~ 387 1
3 K2-146c Pl 08 40 06.4242250368 +19 05 34.430759088           ~ 22 0
4 2MASS J09562720-2406122 NIR 09 56 27.2145369144 -24 06 12.391493436           ~ 1 0
5 HD 86226 PM* 09 56 29.8441909920 -24 05 57.799322988   8.563 7.93 7.71   G2V 97 1
6 HD 86226b Pl 09 56 29.8441909920 -24 05 57.799322988           ~ 13 1
7 HD 86226c Pl 09 56 29.8441909920 -24 05 57.799322988           ~ 29 0
8 Ross 905b Pl 11 42 11.0933350978 +26 42 23.650782778           ~ 913 1
9 K2-131 * 12 11 00.3783875832 -09 45 54.781040484   13.054 12.115     ~ 32 0
10 Kepler-20 Er* 19 10 47.5233433920 +42 20 19.301370684   13.278 12.630 12.478 11.64 G5V 201 1
11 Kepler-289b Pl 19 49 51.6736237968 +42 52 58.268872164           ~ 50 0
12 BD+47 2936b Pl 19 50 50.2472976936 +48 04 51.101390496           ~ 493 1
13 Kepler-18b Pl 19 52 19.0688312520 +44 44 46.807928916           ~ 83 1
14 Kepler-48d Pl 19 56 33.4161659688 +40 56 56.496876216           ~ 51 0

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