Table · dataset · 2025
Light curve & excess absorption of TOI-1259 A b
Listed in IVOA Registry (Virtual Observatory)
The lack of close-in Neptune-mass exoplanets evident in transit surveys has largely been attributed to either photoevaporative mass loss or high-eccentricity migration.
Description
To distinguish between these two possibilities, we investigate the origins of TOI-1259 A b, a Saturn-mass (0.4M_J_, 1.0R_J_) exoplanet lying along the upper edge of the Neptune desert. TOI-1259 A b's close-in (P=3.48d) orbit and low bulk density make the planet particularly vulnerable to photoevaporation.
We studied the upper atmosphere of TOI-1259 A b using metastable helium 1083nm transits observed with Palomar/WIRC and Keck/NIRSPEC. We report a band-integrated excess absorption of 0.395%+/-0.072% with Palomar/WIRC and a spectroscopically resolved 5.5+/-0.94km/s blueshifted absorption of 2.4%+/-0.52% (T1-T4) and 3.5%+/-0.72% (T2-T3) with Keck/NIRSPEC. These measurements indicate the presence of an extended escaping atmosphere.
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Fitting these signals with a Parker wind model, we determine a corresponding atmospheric mass-loss rate of log(\dot{M})=10.2-10.65g/s for thermosphere temperatures between 7900 and 8600K. This relatively low rate suggests that this planet would not have been significantly altered by mass loss even if it formed in situ. However, the presence of a white dwarf companion, TOI-1259 B, hints that this planet may not have formed close-in, but rather migrated inward relatively late.
Given the estimated parameters of the proto-white dwarf companion, we find that high-eccentricity migration is possible for the system.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/169/104 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025AJ....169..104S ui.adsabs.harvard.edu/abs/2025AJ....169..104S ↗
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/169/104 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Infrared
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 73%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/aj/169/104 | 13 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 (73%) |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:infrared | 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 |