Table · dataset · 2026
TOI-4552 radial velocity time series
Listed in IVOA Registry (Virtual Observatory)
A particularly intriguing subclass of rocky exoplanets are the ultra- short period (USP) worlds that orbit their host stars in less than a day.
Description
These planets are particularly rare around M dwarf stars, with so far only ten that have a constrained mass and radius. We present the validation and characterisation of the ultra-short period (0.3 days), Earth-sized planet TOI-4552 b orbiting a nearby (27.26pc away) M4.5V dwarf.
Complementing the TESS photometry, ground-based transit observations from LCO, ExTrA and SPECULOOS validated the planetary radius and cleared the field of any contaminants. Speckle imaging with Zorro (Gemini-S) rules out false positive scenarios caused by eclipsing binary sources. Spectroscopic observations with NIRPS and HARPS were used to obtain stellar abundances, constrain the planetary mass, and, in conjunction with the transit observations, estimate the orbital parameters.
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TOI-4552 is a quiet star exhibiting no short-term stellar variations seen in photometric or radial velocity data that can be associated to stellar rotation. Long-term photometric data from ASAS-SN also suggests a lack of activity signals. TOI-4552 b (Mp=1.83+/-0.47M_{Earth}_, Rp=1.11+/-0.04R_{Earth}_) lies between the Earth-like and iron-rich composition tracks on the Mass-Radius diagram.
The exopie interior structure model, without constraints from refractory abundance ratio, yields a core mass fraction (CMF) of 0.54^+0.17^_-0.25_ and a bulk density of 7.74g/cm^3^. Since the CMF spans a wide range due to the large uncertainty on the mass, the definitive interior composition cannot be determined with the current dataset. TOI-4552 b hints as being marginally more iron- rich compared to the Earth but confirmation of its status requires additional, precise radial velocity measurements.
Combined with its high emission spectroscopic metric (ESM=19.5), negligible stellar activity and short orbital period, TOI-4552 b emerges as a compelling target for atmospheric and surface composition studies with JWST.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/709/A73 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2026A&A...709A..73S ui.adsabs.harvard.edu/abs/2026A%26A...709A..73S ↗
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/709/a73 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Infrared
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Imaging 75%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/709/a73 | 15 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:infrared | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].local:modality:imaging | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (75%) |
| 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 |