Journal article
HD 35843: A Sun-like Star Hosting a Long-period Sub-Neptune and Inner Super-Earth
- Abstract:
- 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 ± 0.08 R⊕, 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.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
Actions
Access Document
- Files:
-
-
(Preview, Version of record, pdf, 17.4MB, Terms of use)
-
- Publisher copy:
- 10.3847/1538-3881/add7d7
Authors
- Publisher:
- American Astronomical Society
- Journal:
- Astronomical Journal More from this journal
- Volume:
- 170
- Issue:
- 2
- Article number:
- 108
- Publication date:
- 2025-07-22
- Acceptance date:
- 2025-04-14
- DOI:
- EISSN:
-
1538-3881
- ISSN:
-
0004-6256
- Language:
-
English
- Keywords:
- Pubs id:
-
2267499
- Local pid:
-
pubs:2267499
- Source identifiers:
-
3135314
- Deposit date:
-
2025-07-22
- ARK identifier:
This ORA record was generated from metadata provided by an external service. It has not been edited by the ORA Team.
Terms of use
- Copyright date:
- 2025
- Licence:
- CC Attribution (CC BY)
If you are the owner of this record, you can report an update to it here: Report update to this record