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 | |
| State | Published - Sep 1 2018 |
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Keywords
- astrometry
- HIP 90365
- SAO 123479)
- stars: individual (HD 169889
- techniques: high angular resolution
- techniques: radial velocities
- white dwarfs
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
Cite this
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 M; Ertel, Steve; Howard, Andrew; Isaacson, Howard.
In: Astrophysical Journal, Vol. 864, No. 1, 42, 01.09.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The TRENDS High-contrast Imaging Survey. VII. Discovery of a Nearby Sirius-like White Dwarf System (HD 169889)
AU - Crepp, Justin R.
AU - Gonzales, Erica J.
AU - Bowler, Brendan P.
AU - Morales, Farisa
AU - Stone, Jordan
AU - Spalding, Eckhart
AU - Vaz, Amali
AU - Hinz, Philip M
AU - Ertel, Steve
AU - Howard, Andrew
AU - Isaacson, Howard
PY - 2018/9/1
Y1 - 2018/9/1
N2 - 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.
AB - 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.
KW - astrometry
KW - HIP 90365
KW - SAO 123479)
KW - stars: individual (HD 169889
KW - techniques: high angular resolution
KW - techniques: radial velocities
KW - white dwarfs
UR - http://www.scopus.com/inward/record.url?scp=85053109854&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85053109854&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/aad381
DO - 10.3847/1538-4357/aad381
M3 - Article
AN - SCOPUS:85053109854
VL - 864
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 42
ER -