Variability in SSTc2d J163134.1-240100, a brown dwarf with quasi-spherical mass loss
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2023
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866913326699642880 |
|---|---|
| author | Scholz, Aleks Muzic, Koraljka Almendros-Abad, Victor Natta, Antonella Ruiz-Rodriguez, Dary Cieza, Lucas Rodriguez-Lopez, Cristina |
| author_facet | Scholz, Aleks Muzic, Koraljka Almendros-Abad, Victor Natta, Antonella Ruiz-Rodriguez, Dary Cieza, Lucas Rodriguez-Lopez, Cristina |
| contents | We report on a search for variability in the young brown dwarf SST1624 (~M7 spectral type, M~0.05Msol), previously found to feature an expanding gaseous shell and to undergo quasi-spherical mass loss. We find no variability on timescales of 1-6hours. Specifically, on these timescales, we rule out the presence of a period with amplitude >1%. A photometric period in that range would have been evidence for either pulsation powered by Deuterium burning or rotation near breakup. However, we see a 3% decrease in the K-band magnitude between two consecutive observing nights (a 10sigma result). There is also clear evidence for variations in the WISE lightcurves at 3.6 and 4.5 microns on timescales of days, with a tentative period of about 6d (with a plausible range between 3 and 7d). The best explanation for the variations over days is rotational modulation due to spots. These results disfavour centrifugal winds driven by fast rotation as mechanism for the mass loss, which, in turn, makes the alternative scenario -- a thermal pulse due to Deuterium burning -- more plausible. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_14087 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Variability in SSTc2d J163134.1-240100, a brown dwarf with quasi-spherical mass loss Scholz, Aleks Muzic, Koraljka Almendros-Abad, Victor Natta, Antonella Ruiz-Rodriguez, Dary Cieza, Lucas Rodriguez-Lopez, Cristina Solar and Stellar Astrophysics Earth and Planetary Astrophysics We report on a search for variability in the young brown dwarf SST1624 (~M7 spectral type, M~0.05Msol), previously found to feature an expanding gaseous shell and to undergo quasi-spherical mass loss. We find no variability on timescales of 1-6hours. Specifically, on these timescales, we rule out the presence of a period with amplitude >1%. A photometric period in that range would have been evidence for either pulsation powered by Deuterium burning or rotation near breakup. However, we see a 3% decrease in the K-band magnitude between two consecutive observing nights (a 10sigma result). There is also clear evidence for variations in the WISE lightcurves at 3.6 and 4.5 microns on timescales of days, with a tentative period of about 6d (with a plausible range between 3 and 7d). The best explanation for the variations over days is rotational modulation due to spots. These results disfavour centrifugal winds driven by fast rotation as mechanism for the mass loss, which, in turn, makes the alternative scenario -- a thermal pulse due to Deuterium burning -- more plausible. |
| title | Variability in SSTc2d J163134.1-240100, a brown dwarf with quasi-spherical mass loss |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2307.14087 |