Table · dataset · 2025
Ross 176 phot., RVs, activity indices
Listed in IVOA Registry (Virtual Observatory)
The Transiting Exoplanet Survey Satellite (TESS) discovers several new planet candidates that need to be confirmed and characterized with ground-based observations.
Description
This is the case for Ross 176, a late K-type star that hosts a promising water world candidate planet. The star has a radius of R_star_=0.569+/-0.020R_{sun}_ and a mass of M_star_=0.577+/-0.024M_{sun}_.
Here, we constrain the planetary mass using spectroscopic data from CARMENES, an instrument that has already played a major role in confirming the planetary nature of the transit signal detected by TESS. We make use of Gaussian Processes (GP) to improve the analysis because the host star has a relatively strong activity that affects the radial-velocity dataset. In addition, we applied a GP to the TESS light curves to reduce the correlated-noise in the detrended dataset.
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The stellar activity indicators show a strong signal related to the star rotation period of ~32-days. This stellar activity signal was also confirmed on the TESS light curves. Ross 176b is an inner hot transiting planet with a low eccentricity orbit of ecc=0.25+/-0.04, an orbital period of P~5-days, and an equilibrium temperature of T_eq_~682K.
With a radius of R_p_=1.84+/-0.08R_{Earth}_ (4% precision), a mass of M_p_=4.57^+0.89^_-0.93_M_{Earth}_ (20% precision), and a mean density of rho_p_=4.03^+0.49^_-0.81_g/cm^3^, the composition of Ross 176b is consistent with a water world scenario. Moreover, Ross 176b is a promising target for atmospheric characterization, which could lead to more information on the existence, formation and composition of water worlds.
This detection increases the sample of planets orbiting K-type stars, which is valuable to investigate the presence of the small planet radius valley around this type of star. This study also showcases the efficiency of the dual detection between space- and ground-based telescopes to confirm new planets.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/700/A216 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025A&A...700A.216G ui.adsabs.harvard.edu/abs/2025A%26A...700A.216G ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/a%2Ba/700/a216 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 70%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/700/a216 | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].anzsrc:group:5101 | enrichment · IVOA Registry | taxonomy-embedding@1.1.0 | title+keywords+description (70%) |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:optical | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |