Artykuł w czasopiśmie
Brak miniatury
Licencja
 

AD Leonis: Radial Velocity Signal of Stellar Rotation or Spin-Orbit Resonance?

Uproszczony widok
cris.lastimport.scopus2024-02-12T20:41:32Z
dc.abstract.enAD Leonis is a nearby magnetically active M dwarf. We find Doppler variability with a period of 2.23 days, as well as photometric signals: (1) a short-period signal, which is similar to the radial velocity signal, albeit with considerable variability; and (2) a long-term activity cycle of 4070 ± 120 days. We examine the short-term photometric signal in the available All-Sky Automated Survey and Microvariability and Oscillations of STars (MOST) photometry and find that the signal is not consistently present and varies considerably as a function of time. This signal undergoes a phase change of roughly 0.8 rad when considering the first and second halves of the MOST data set, which are separated in median time by 3.38 days. In contrast, the Doppler signal is stable in the combined High-Accuracy Radial velocity Planet Searcher and High Resolution Echelle Spectrometer radial velocities for over 4700 days and does not appear to vary in time in amplitude, phase, period, or as a function of extracted wavelength. We consider a variety of starspot scenarios and find it challenging to simultaneously explain the rapidly varying photometric signal and the stable radial velocity signal as being caused by starspots corotating on the stellar surface. This suggests that the origin of the Doppler periodicity might be the gravitational tug of a planet orbiting the star in spin-orbit resonance. For such a scenario and no spin-orbit misalignment, the measured v\sin i indicates an inclination angle of 15.°5 ± 2.°5 and a planetary companion mass of 0.237 ± 0.047 M <SUB>Jup</SUB>.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorTuomi, Mikko
dc.contributor.authorJones, Hugh R. A.
dc.contributor.authorBarnes, John R.
dc.contributor.authorAnglada-Escudé, Guillem
dc.contributor.authorButler, R. Paul
dc.contributor.authorKiraga, Marcin
dc.contributor.authorVogt, Steven S.
dc.date.accessioned2024-01-24T15:39:03Z
dc.date.available2024-01-24T15:39:03Z
dc.date.copyright2018-02-16
dc.date.issued2018
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number5
dc.description.versionORIGINAL_AUTHOR
dc.description.volume155
dc.identifier.doi10.3847/1538-3881/AAB09C
dc.identifier.issn0004-6256
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/100294
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2018AJ....155..192T
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomical Journal
dc.relation.pages192
dc.rightsOther
dc.sciencecloudnosend
dc.titleAD Leonis: Radial Velocity Signal of Stellar Rotation or Spin-Orbit Resonance?
dc.typeJournalArticle
dspace.entity.typePublication