2025AJ....170..108H

Query : 2025AJ....170..108H

2025AJ....170..108H - Astron. J., 170, 108 (2025/August-0)

HD 35843: A Sun-like Star Hosting a Long-period Sub-Neptune and Inner Super-Earth.

HESSE K., MIRELES I., BOUCHY F., DRAGOMIR D., ULMER-MOLL S., EISNER N.L., STASSUN K.G., QUINN S.N., OSBORN H.P., SOUSA S.G., WATKINS C.N., COLLINS K.A., BRYANT E.M., IRWIN J.M., HELLIER C., JOHNSON M.C., ZIEGLER C., HOWELL S.B., ANDERSON D.R., BAYLISS D., BIERYLA A., BRICENO C., BUTLER R.P., CHARBONNEAU D., CLOUTIER R., CRANE J., DITTMANN J., EASTMAN J.D., FREIGEIRO S.A., FULTON B.J., GILL S., GUNTHER M., IM H., JENKINS J.M., KUNIMOTO M., LAVIE B., LENDL M., LUND M.B., MANN A.W., NICHOLSON B., OSIP D., PAEGERT M., SANTOS N.C., SCHWARZ R.P., SEAGER S., SHECTMAN S., TESKE J., TWICKEN J.D., UDRY S., VAN EYLEN V., VINES J., WANG S.X., WHEATLEY P.J., WINN J.N. and ZUIDEMA E.E.

Abstract (from CDS):

We report the discovery and confirmation of two planets orbiting the metal-poor Sun-like star HD 35843 (TOI 4189). HD 35843 c is a temperate sub-Neptune transiting planet with an orbital period of 46.96 days that was first identified by Planet Hunters TESS. We combine data from TESS and follow-up observations to rule out false-positive scenarios and validate the planet. We then use ESPRESSO radial velocities (RVs) to confirm the planetary nature and characterize the planet's mass and orbit. Further analysis of these RVs reveals the presence of an additional planet, HD 35843 b, with a period of 9.90 days and a minimum mass of 5.84 ± 0.84 M⊕. For HD 35843 c, a joint photometric and spectroscopic analysis yields a radius of 2.54 ± 0.08R⊕, a mass of 11.32 ± 1.60 M⊕, and an orbital eccentricity of e = 0.15 ± 0.07. With a bulk density of 3.80 ± 0.70 g cm–3, the planet might be rocky with a substantial H2 atmosphere or it might be a “water world.” With an equilibrium temperature of ∼480 K, HD 35843 c is among the coolest ∼5% of planets discovered by TESS. Combined with the host star's relative brightness (V = 9.4), HD 35843 c is a promising target for atmospheric characterization that will probe this sparse population of temperate sub-Neptunes.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanet astronomy - Exoplanet detection methods - Planet hosting stars - Transit photometry - Radial velocity - High resolution spectroscopy - Exoplanets - Exoplanet systems

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 HD 3167 PM* 00 34 57.5242131960 +04 22 53.284093032       8.4   K0V 128 0
2 HD 22946b Pl 03 39 16.7617744728 -42 45 45.185938812           ~ 6 0
3 HD 22946c Pl 03 39 16.7617744728 -42 45 45.185938812           ~ 5 0
4 HD 22946d Pl 03 39 16.7617744728 -42 45 45.185938812           ~ 9 0
5 HD 22946 PM* 03 39 16.7617744728 -42 45 45.185938812   8.77 8.26     F7/8V 42 0
6 HD 35843 PM* 05 25 23.7977745336 -44 25 50.916713052   10.04 9.769     G5V 25 0
7 HD 35843c Pl 05 25 23.7977745336 -44 25 50.916713052           ~ 1 0
8 HD 35843b Pl 05 25 23.7977745336 -44 25 50.916713052           ~ 1 0
9 Gaia DR3 4799563663371481472 * 05 25 24.4556278999 -44 26 04.044224703           ~ 1 0
10 CD-26 2288c Pl 05 33 04.6005234792 -26 43 28.268361984           ~ 10 0
11 CD-26 2288d Pl 05 33 04.6005234792 -26 43 28.268361984           ~ 20 0
12 CD-26 2288b Pl 05 33 04.6005234792 -26 43 28.268361984           ~ 37 0
13 CD-26 2288 PM* 05 33 04.6005234792 -26 43 28.268361984   10.17 9.13     K3+Vk: 79 0
14 K2-18b Pl 11 30 14.5177445592 +07 35 18.255348492           ~ 303 0

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