Table · dataset · 2026
L 98-59 f confirmed with TESS, HARPS, ESPRESSO
Listed in IVOA Registry (Virtual Observatory)
The L 98-59 system, identified by TESS in 2019, features three transiting exoplanets in compact orbits of 2.253, 3.691, and 7.451days around an M3V star, with an outer 12.83day nontransiting planet confirmed in 2021 using ESPRESSO.
Description
The planets exhibit a diverse range of sizes (0.8-1.6R_{Earth}_), masses (0.5-3M_{Earth}_), and likely compositions (Earth-like to possibly water-rich), prompting atmospheric characterization studies with Hubble Space Telescope and JWST.
Here, we analyze 16 new TESS sectors and improve radial velocity (RV) precision of archival ESPRESSO and HARPS data using a line-by-line framework, enabling stellar activity detrending via a novel differential temperature indicator. We refine the radii of L 98-59 b, c, and d to 0.837+/-0.019R_{Earth}_, 1.329+/-0.029R_{Earth}_, and 1.627+/-0.041R_{Earth}_, respectively. Combining RVs with transit timing variations (TTVs) of L 98-59 c and d from TESS and JWST provides unprecedented constraints on the masses and eccentricities of the planets.
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We report updated masses of 0.46+/-0.11M_{Earth}_ for b, 2.00+/-0.13M_{Earth}_ for c, and 1.64+/-0.07M_{Earth}_ for d, and a minimum mass of 2.82+/-0.19M_{Earth}_ for e. We additionally confirm L 98-59 f, a nontransiting super-Earth with a minimal mass of 2.80+/-0.30M_{Earth}_ on a 23.06day orbit inside the Habitable Zone. The TTVs of L 98-59 c and d (<3min, PTTV=396days) constrain the eccentricities of all planets to near-circular orbits (e<=0.04).
An internal structure analysis of the transiting planets reveals increasing water-mass fractions (f_H2O_) with orbital distance, reaching f_H2O_~0.16 for L 98-59 d. We predict eccentricity-induced tidal heating in L 98-59 b with heat fluxes comparable to those of Io, potentially driving volcanic activity.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/170/154 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025AJ....170..154C ui.adsabs.harvard.edu/abs/2025AJ....170..154C ↗
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/aj/170/154 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/aj/170/154 | 12 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| 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 |