Table · dataset · 2023
Mdwarfs Ha luminosity & photometric amplitudes
Listed in IVOA Registry (Virtual Observatory)
While many M-dwarfs are known to have strong magnetic fields and high levels of magnetic activity, we are still unsure about the properties of their starspots and the origin of their magnetic dynamos.
Description
Both starspots and chromospheric heating are generated by the surface magnetic field; they produce photometric variability and H{alpha} emission, respectively. Connecting brightness variations to magnetic activity therefore provides a means to examine M-dwarf magnetism.
We survey 30M dwarfs previously identified as fast rotating stars (Prot<10days). We present time-series optical photometry from the Transiting Exoplanet Survey Satellite (TESS) and contemporaneous optical spectra obtained using the Ohio State Multi-Object Spectrograph (OSMOS) on the 2.4m Hiltner telescope at MDM Observatory in Arizona. We measure rotation periods and photometric amplitudes from TESS light curves using Gaussian Processes.
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From the OSMOS spectra, we calculate the equivalent width of H{alpha}, and LH{alpha}/Lbol. We find a weak positive correlation between H{alpha} luminosity and the semiamplitude, Rvar (p=0.005_-0.005_^+0.075^). We also observe short-term variability (between 20 and 45minutes) in H{alpha} equivalent widths and possible enhancement from flares consistent to recent literature.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/165/192 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2023AJ....165..192G ui.adsabs.harvard.edu/abs/2023AJ....165..192G ↗
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/165/192 ↗
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/165/192 | 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 | |
| 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 |