J/ApJ/940/165 Radial-velocity monitoring of 2MASSJ06163552+2319094 (Yuan+, 2022)
Discovery of one neutron star candidate from radial-velocity monitoring.
Yuan H., Wang S., Bai Z., Wang Y., Dong Y., Wang M., Yu S., Zhao Y.,
Chu Y., Liu J., Zhang H.
<Astrophys. J., 940, 165 (2022)>
=2022ApJ...940..165Y 2022ApJ...940..165Y
ADC_Keywords: Radial velocities; Spectra, optical; Stars, neutron;
Stars, double and multiple
Keywords: Ellipsoidal variable stars ; Compact binary stars ; Neutron stars
Abstract:
We report the discovery of one possible neutron star binary
(Porb=0.8666d) by using LAMOST low-resolution spectroscopic data.
The visible companion is a late A-type dwarf (Teff=7900±200K;
logg=4.3±0.2; M=1.7±0.1M☉; R=1.7±0.2R☉) at a
distance of 1.11±0.03kpc. No double-lined feature can be seen from
the Gran Telescopio Canarias/HORuS high-resolution spectra; thus the
radial-velocity variation indicates an invisible object hiding in the
binary. The system's optical light curves show clear ellipsoidal
variability, suggesting that the visible companion is tidal distorted.
By fitting the multiband light curves with the eclipsing light-curve
(ELC) code and the Wilson-Devinney (WD) code, we constrain the mass of
the invisible star to be 1.1-1.3M☉. Spectral disentangling shows
no additional component with optical absorption spectra, supporting
the idea that the system contains one compact object. No X-ray or UV
emission is detected in the ROSAT archive observations. Therefore, we
suspect the invisible object is more likely a neutron star rather than
a white dwarf. Our finding suggests the ability of LAMOST
spectroscopic survey to discover X-ray-quiescent compact objects.
Description:
To obtain multiband LCs of 2MASS J06163552+2319094 with higher
accuracy than ASAS-SN and ZTF data, we carried out imaging
observations on five nights (2020 January 5/6/7; 2020 February 5/7)
with the 85cm telescope at the Xinglong Station of the National
Astronomical Observatories of China (NAOC) in the
Johnson-Cousin-Bessell UBVRcIc filter system.
The LAMOST plate containing J06163552 gained 210 low-resolution
exposures from 2015 March to 2019 January and gained
13 medium-resolution exposures from 2020 December to 2021 February.
See Section 2.2.1.
The high optical resolution spectrograph (HORuS), a
moderate-resolution echelle spectrograph (R∼25000), is in operation at
the 10.4m Gran Telescopio Canarias (GTC). The wavelength coverage
ranges from 370 to 690nm. J06163552 was observed three times
(2019 November 21/26) with HORuS.
See Section 2.2.2.
Objects:
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RA (ICRS) DE Designation(s) (Period)
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06 16 35.52 +23 19 09.3 J06163552 = ZTF J061635.52+231909.4 (P=0.8666)
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 24 125 Barycentric-corrected RV values from LAMOST
low-resolution observations
table2.dat 35 6 Barycentric-corrected (B- and R-band) RV values
from LAMOST medium resolution observations
table3.dat 23 3 Barycentric-corrected RV values from HORuS
observations
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)
I/284 : The USNO-B1.0 Catalog (Monet+ 2003)
I/340 : UCAC5 Catalogue (Zacharias+ 2017)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/ApJ/809/25 : Stellar & planet data for K2 candidates (Montet+, 2015)
J/A+A/588/A103 : 2nd ROSAT all-sky survey (2RXS) source cat. (Boller+, 2016)
J/MNRAS/479/5491 : Absolute parameters of 509 main-sequence stars (Eker+, 2018)
J/other/RAA/19.64 : LAMOST sp. binaries & variable stars (Qian+, 2019)
J/ApJS/249/18 : The ZTF catalog of periodic variable stars (Chen+, 2020)
J/ApJS/251/15 : LAMOST-Kepler/K2 survey (LK-MRS) 1st year obs. (Zong+, 2020)
J/other/RAA/21.292 : LAMOST Time-Domain survey, first results (Wang+, 2021)
J/A+A/659/A95 : Survey of Surveys. I. Radial velocities (Tsantaki+, 2022)
J/ApJS/259/11 : LAMOST variable sources based on ZTF phot. (Xu+, 2022)
J/ApJS/266/14 : Am stars selected in LAMOST DR8-DR10 (Tian+, 2023)
J/ApJS/271/4 : Rotational velocities for LAMOST DR9 stars (Zuo+, 2024)
J/ApJS/272/1 : Periodic variable stars from LAMOST DR9 (Qiao+, 2024)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.5 d BJD [57085.5/58456.8] Barycentric Julian Date,
BJD-2400000.5
13- 18 F6.2 km/s BRV [-99/154] Barycentric-corrected radial velocity
20- 24 F5.2 km/s e_BRV [7.3/11] Uncertainty in BRV
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.5 d BJD [59236.5/59264.6] Barycentric Julian Date,
BJD-2400000.5
13- 18 F6.2 km/s BRVb [-94/30] Barycentric-corrected radial velocity,
B-band
20- 23 F4.2 km/s e_BRVb [1/4.3] Uncertainty in BRVb
25- 30 F6.2 km/s BRVr [-90/28] Barycentric-corrected radial velocity,
R-band
32- 35 F4.2 km/s e_BRVr [1.3/2.4] Uncertainty in BRVr
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.5 d BJD [58809.2/58814.1] Barycentric Julian Date,
BJD-2400000.5
13- 18 F6.2 km/s BRV [-87/134] Barycentric-corrected radial velocity
20- 23 F4.2 km/s e_BRV [4.3/4.6] Uncertainty in BRV
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 13-Nov-2024