J/AJ/166/143ivo://CDS.VizieR/J/AJ/166/143doi:10.26093/cds/vizier.51660143CDSWu Y.-L.Cheng Y.-C.Huang L.-C.Bowler B.P.Close L.M.Tseng W.-L.,Chen N.Chen D.-W.2024-11-06T20:17:48Z2024-04-22T07:09:32ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frexoplanetsbrown-dwarfsvisible-astronomyh-alpha-photometryMonitoring mass accretion onto substellar objects provides insights into the geometry of the accretion flows. We use the Lulin One-meter Telescope to monitor H{alpha} emission from FUTauB, a ~19MJup brown-dwarf companion at 5.7" (719au) from the host star, for six consecutive nights. This is the longest continuous H{alpha} monitoring for a substellar companion near the deuterium-burning limit. We aim to investigate if accretion near the planetary regime could be rotationally modulated as suggested by magnetospheric accretion models. We find tentative evidence that H{alpha} mildly varies on hourly and daily timescales, though our sensitivity is not sufficient to definitively establish any rotational modulation. No burst-like events are detected, implying that accretion onto FUTauB is overall stable during the time baseline and sampling windows over which it was observed. The primary star FUTauA also exhibits H{alpha} variations over timescales from minutes to days. This program highlights the potential of monitoring accretion onto substellar objects with small telescopes.2023AJ....166..143Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/166/143CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/352 : Distances 1.47 billion stars Gaia EDR3 (Bailer-Jones+, 2021)J/A+A/349/619 : UBVRI light curves of AA Tau in 1995 (Bouvier+, 1999)J/A+A/548/A56 : X-shooter spectra 12 young stellar objects (Rigliaco+, 2012)J/A+A/551/A107 : X-shooter spectra of 24 young stellar objects (Manara+, 2013)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)J/AJ/147/82 : Monitoring of disk-bearing stars in NGC 2264 (Cody+, 2014)J/ApJ/788/40 : Late-type targets in Taurus, Cha I & UpperSco (Todorov+, 2014)J/A+A/605/A86 : Pre-main sequence stars VLT/X-Shooter spectra (Manara+, 2017)J/AJ/156/71 : K2 Campaign2 young disk-bearing stars in Sco&Oph (Cody+, 2018)J/AJ/165/164 : Tull RVels, rotation periods and Inclinations (Bowler+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/166/143https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/166/143http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/166/143https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/166/143https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/166/143http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/166/143GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/166/143/table2Relative photometry between FU Tau A and 2MASS J04241447+2506106recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date at exposure midpointdtime.epochdoubledmagMagnitude difference at H{alpha}magphot.mag;arith.difffloate_dmagUncertainty in dmagmagstat.error;phot.magfloatJ/AJ/166/143/table3Relative photometry between FU Tau B and 2MASS J04241447+2506106recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date at exposure midpointdtime.epochdoubledmagMagnitude difference at H{alpha}magphot.mag;arith.difffloate_dmagUncertainty in dmagmagstat.error;phot.magfloat