The TRENDS High-contrast Imaging Survey. VII. Discovery of a Nearby Sirius-like White Dwarf System (HD 169889)
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Author
Crepp, Justin R.
Gonzales, Erica J.
Bowler, Brendan P.
Morales, Farisa
Stone, Jordan
Spalding, Eckhart
Vaz, Amali
Hinz, Philip
Ertel, Steve
Howard, Andrew
Isaacson, Howard T.

Affiliation
Univ Arizona, Steward ObservIssue Date
2018-09-01Keywords
astrometrystars: individual (HD 169889, HIP 90365, SAO 123479)
techniques: high angular resolution
techniques: radial velocities
white dwarfs
Metadata
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IOP PUBLISHING LTDCitation
Justin R. Crepp et al 2018 ApJ 864 42Journal
ASTROPHYSICAL JOURNALRights
© 2018. The American Astronomical Society. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Monitoring the long-term radial velocity (RV) and acceleration of nearby stars has been proven as an effective method for directly detecting binary and substellar companions. Some fraction of nearby RV trend systems are expected to be comprised of compact objects that likewise induce a systemic Doppler signal. In this paper, we report the discovery of a white dwarf (WD) companion found to orbit the nearby (pi = 28.297 +/- 0.066 mas) G9 V star HD. 169889. High-contrast imaging observations using NIRC2 at the W. M. Keck Observatory and LMIRCam at the Large Binocular Telescope (LBT) Observatory uncover the (Delta H = 9.76 +/- 0.16,Delta L' = 9.60 +/- 0.03) companion at an angular separation of 0.'' 8 (28 au). Thirteen years of precise Doppler observations reveal a steep linear acceleration in the RV time series and place a dynamical constraint on the companion mass of M >= 0.369 +/- 0.010 M-circle dot. This "Sirius-like" system adds to the census of WD companions suspected to be missing from surveys of in the solar neighborhood.ISSN
1538-4357Version
Final published versionSponsors
NASA Origins of Solar Systems grant [NNX13AB03G]; NASA Early Career Fellowship; NSF Career Fellowship; NSF graduate research fellowship program; W.M. Keck FoundationAdditional Links
http://stacks.iop.org/0004-637X/864/i=1/a=42?key=crossref.8cdc6c52c41eaa9925d8eac252ad3647ae974a485f413a2113503eed53cd6c53
10.3847/1538-4357/aad381