Table · dataset · 2019
Transit timing and light curves for K2-146
Listed in IVOA Registry (Virtual Observatory)
K2-146 is a mid-M dwarf (M_*_=0.331+/-0.009 M_{sun}_; R_*_=0.330+/-0.010 R_{sun}_), observed in Campaigns 5, 16, and 18 of the K2 mission.
Description
In Campaign 5 data, a single planet was discovered with an orbital period of 2.6 days and large transit timing variations due to an unknown perturber. Here, we analyze data from Campaigns 16 and 18, detecting the transits of a second planet, c, with an orbital period of 4.0 days, librating in a 3:2 resonance with planet b.
Large, anticorrelated timing variations of both planets exist due to their resonant perturbations. The planets have a mutual inclination of 2.40{deg}+/-0.25{deg}, which torqued planet c more closely into our line of sight. Planet c was grazing in Campaign 5 and thus missed in previous searches; it is fully transiting in Campaigns 16 and 18, and its transit depth is three times larger.
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We improve the stellar properties using data from Gaia DR2 (Cat. I/345), and use dynamical fits to find that both planets are sub-Neptunes: their masses are 5.77+/-0.18 and 7.50+/-0.23 M_{Earth}_, and their radii are 2.04+/-0.06 and 2.19+/-0.07 R_{Earth}_, respectively. These mass constraints set the precision record for small exoplanets (a few gas giants have comparable relative precision).
These planets lie in the photoevaporation valley when viewed in Radius-Period space, but due to the low-luminosity M-dwarf host star, they lie among the atmosphere-bearing planets when viewed in Radius-Irradiation space. This, along with their densities being 60-80% that of Earth, suggests that they may both have retained a substantial gaseous envelope.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/158/133 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2019AJ....158..133H ui.adsabs.harvard.edu/abs/2019AJ....158..133H ↗
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/158/133 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 7 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/aj/158/133 | 14 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 | |
| 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 |