The TRENDS High-contrast Imaging Survey. VII. Discovery of a Nearby Sirius-like White Dwarf System (HD 169889)

Justin R. Crepp; Erica J. Gonzales; Brendan P. Bowler; Farisa Morales; Jordan Stone; Eckhart Spalding; Amali Vaz; Philip Hinz; Steve Ertel; Andrew Howard; Howard Isaacson

doi:10.3847/1538-4357/aad381

The TRENDS High-contrast Imaging Survey. VII. Discovery of a Nearby Sirius-like White Dwarf System (HD 169889)

Justin R. Crepp, Erica J. Gonzales, Brendan P. Bowler, Farisa Morales, Jordan Stone, Eckhart Spalding, Amali Vaz, Philip Hinz, Steve Ertel, Andrew Howard, Howard Isaacson

Astronomy

Research output: Contribution to journal › Article

3 Scopus citations

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 (π = 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 (ΔH = 9.76 ± 0.16, ΔL′ = 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. This "Sirius-like" system adds to the census of WD companions suspected to be missing from surveys of in the solar neighborhood.

Original language	English (US)
Article number	42
Journal	Astrophysical Journal
Volume	864
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aad381
State	Published - Sep 1 2018

Keywords

HIP 90365
SAO 123479)
astrometry
stars: individual (HD 169889
techniques: high angular resolution
techniques: radial velocities
white dwarfs

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Crepp, J. R., Gonzales, E. J., Bowler, B. P., Morales, F., Stone, J., Spalding, E., Vaz, A., Hinz, P., Ertel, S., Howard, A., & Isaacson, H. (2018). The TRENDS High-contrast Imaging Survey. VII. Discovery of a Nearby Sirius-like White Dwarf System (HD 169889). Astrophysical Journal, 864(1), [42]. https://doi.org/10.3847/1538-4357/aad381

The TRENDS High-contrast Imaging Survey. VII. Discovery of a Nearby Sirius-like White Dwarf System (HD 169889). / 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.

In: Astrophysical Journal, Vol. 864, No. 1, 42, 01.09.2018.

Research output: Contribution to journal › Article

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