J/AJ/162/44ivo://CDS.VizieR/J/AJ/162/44doi:10.26093/cds/vizier.51620044CDSSteiger S.Currie T.Brandt T.D.Guyon O.Kuzuhara M.Chilcote J.,Groff T.D.Lozi J.Walter A.B.Fruitwala N.Bailey III J.I.Zobrist N.,Swimmer N.Lipartito I.Smith J.P.Bockstiegel C.Meeker S.R.,Coiffard G.Dodkins R.Szypryt P.Davis K.K.Daal M.Bumble B.,Vievard S.Sahoo A.Deo V.Jovanovic N.Martinache F.Doppmann G.,Tamura M.Kasdin N.J.Mazin B.A.2022-03-14T06:55:09Z2021-11-29T09:16:26ZCDS support team

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

cds-question@unistra.fra-starsexoplanetsinfrared-astronomyspectroscopyWe report the direct imaging discovery of a low-mass companion to the nearby accelerating A star, HIP109427, with the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument coupled with the Microwave Kinetic Inductance Detector Exoplanet Camera (MEC) and CHARIS integral field spectrograph. CHARIS data reduced with reference star point spread function (PSF) subtraction yield 1.1-2.4{mu}m spectra. MEC reveals the companion in Y and J band at a comparable signal-to-noise ratio using stochastic speckle discrimination, with no PSF subtraction techniques. Combined with complementary follow-up Lp photometry from Keck/NIRC2, the SCExAO data favors a spectral type, effective temperature, and luminosity of M4-M5.5, 3000-3200K, and log_10_(L/L{odot})=-2.28_-0.04_^+0.04^, respectively. Relative astrometry of HIP109427B from SCExAO/CHARIS and Keck/NIRC2, and complementary Gaia-Hipparcos absolute astrometry of the primary favor a semimajor axis of 6.55+3.0-0.48au, an eccentricity of 0.54_-0.15_^+0.28^, an inclination of 66.7_-14_^+8.5^degrees, and a dynamical mass of 0.280_-0.059_^+0.18^M{sun}. This work shows the potential for extreme AO systems to utilize speckle statistics in addition to widely used postprocessing methods to directly image faint companions to nearby stars near the telescope diffraction limit.2021AJ....162...44Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/162/44CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)J/AJ/129/2420 : Proper motion derivatives of binaries (Makarov+, 2005)J/AJ/132/161 : NStars project: The southern sample. I. (Gray+, 2006)J/MNRAS/389/585 : Fundamental parameters of M dwarfs (Casagrande+, 2008)J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)J/MNRAS/437/1216 : VAST Survey. A-type stars multiplicity (De Rosa+, 2014)J/ApJ/804/146 : Atmospheric parameters for nearby B-F stars (David+, 2015)J/ApJS/219/33 : BANYAN. VII. Candidate YMG members from BASS (Gagne+, 2015)J/other/Sci/350.64 : 51 Eri b near-infrared spectrum (Macintosh+, 2015)J/A+A/605/L9 : NIR spectrum of exoplanet HIP 65426b (Chauvin+, 2017)J/ApJ/856/23 : BANYAN. XI. The BANYAN {Sigma} algorithm (Gagne+, 2018)J/AJ/156/286 : The LEECH exoplanet imaging survey (Stone+, 2018)J/AJ/158/13 : The first 300 stars observed by the GPIES (Nielsen+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/162/44https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/162/44http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/162/44https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/162/44https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/162/44http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/162/44GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/AJ/162/44/fig3Combined table from original tablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelengthumem.wldoubleBandCorresponding band of observationinstr.bandpasscharFluxFlux densitymJyphot.flux.density;em.IRfloate_FluxMean error on flux densitymJystat.error;phot.fluxdoubleSNRSignal to Noise Ratiostat.snrdouble