astrometry; binaries: visual; instrumentation: adaptive optics; stars: imaging; white dwarfs
Abstract :
[en] We present new observations of the faint "Sirius-like" companion discovered to orbit HD 114174. Previous attempts to image HD 114174 B at mid-infrared wavelengths using NIRC2 at Keck have resulted in a non-detection. Our new L'-band observations taken with the Large Binocular Telescope and L/M-band InfraRed Camera recover the companion (ΔL = 10.15 ± 0.15 mag, ρ = 0.''675 ± 0.''016) with a high signal-to-noise ratio (10σ). This measurement represents the deepest L' high-contrast imaging detection at subarcsecond separations to date, including extrasolar planets. We confirm that HD 114174 B has near-infrared colors consistent with the interpretation of a cool white dwarf (WD; J - L' = 0.76 ± 0.19 mag, K - L' = 0.64 ± 0.20). New model fits to the object's spectral energy distribution indicate a temperature T [SUB]eff[/SUB] = 4260 ± 360 K, surface gravity log g = 7.94 ± 0.03, a cooling age t[SUB]c[/SUB] ≈ 7.8 Gyr, and mass M = 0.54 ± 0.01 M [SUB]⊙[/SUB]. We find that the cooling ages given by theoretical atmospheric models do not agree with the age of HD 114174 A derived from both isochronological and gyrochronological analyses. We speculate on possible scenarios to explain the apparent age discrepancy between the primary and secondary. HD 114174 B is a nearby benchmark WD that will ultimately enable a dynamical mass estimate through continued Doppler and astrometric monitoring. Efforts to characterize its physical properties in detail will test theoretical atmospheric models and improve our understanding of WD evolution, cooling, and progenitor masses.
Disciplines :
Physics
Author, co-author :
Matthews, Christopher T.; Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556, USA
Crepp, Justin R.; Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556, USA
Skemer, Andrew; Department of Astronomy, University of Arizona, 993 N. Cherry Ave, Tucson, AZ 85721, USA
Hinz, Philip M.; Department of Astronomy, University of Arizona, 993 N. Cherry Ave, Tucson, AZ 85721, USA
Gianninas, Alexandros; Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019, USA
Kilic, Mukremin; Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019, USA
Skrutskie, Michael; Department of Astronomy, University of Virginia, Charlottesville, VA 22904, USA
Bailey, Vanessa P.; Department of Astronomy, University of Arizona, 993 N. Cherry Ave, Tucson, AZ 85721, USA
Defrere, Denis ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Leisenring, Jarron; Department of Astronomy, University of Arizona, 993 N. Cherry Ave, Tucson, AZ 85721, USA
Esposito, Simone; Istituto Nazionale di Astrofisica, Osservatorio Astrofisico di Arcetri Largo E. Fermi I-550125 Firenze, Italy
Puglisi, Alfio; Istituto Nazionale di Astrofisica, Osservatorio Astrofisico di Arcetri Largo E. Fermi I-550125 Firenze, Italy)
Language :
English
Title :
Mid-infrared High-contrast Imaging of HD 114174 B: An Apparent Age Discrepancy in a "Sirius-like" Binary System
Publication date :
01 March 2014
Journal title :
Astrophysical Journal. Letters
ISSN :
2041-8205
eISSN :
2041-8213
Publisher :
Institute of Physics Publishing, Bristol, United Kingdom
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