2025ApJ...985..192C

Query : 2025ApJ...985..192C

2025ApJ...985..192C - Astrophys. J., 985, 192 (2025/June-1)

Search for Continuous Gravitational Waves from Unknown Neutron Stars in Binary Systems with Long Orbital Periods in O3 Data.

COVAS P.B., PAPA M.A. and PRIX R.

Abstract (from CDS):

Gravitational waves emitted by asymmetric rotating neutron stars are the primary targets of continuous gravitational-wave searches. Neutron stars in binary systems are particularly interesting due to the potential for nonaxisymmetric deformations induced by a companion star. However, all-sky searches for unknown neutron stars in binary systems are very computationally expensive, and this limits their sensitivity and/or breadth. In this paper we present results of a search for signals with gravitational-wave frequencies between 50 and 150 Hz, from systems with orbital periods between 100 and 1000 days and projected semimajor axes between 40 and 200 lt-s. This parameter space region has never been directly searched before. We do not detect any signal, and our results exclude gravitational-wave amplitudes above 1.25 × 10–25 at 144.32 Hz with 95% confidence. Our improved search pipeline is more sensitive than any previous all-sky binary search by about 75%.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gravitational waves - Neutron stars

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* V818 Sco LXB 16 19 55.0692669024 -15 38 25.017666540 11.60 12.40 11.1     Oev 1730 0

Query : 2025ApJ...985..192C

Basic data :
V* V818 Sco -- Low Mass X-ray Binary
Other object types: otypes_help 		X (2022MNRAS,X,...), * (EPIC,PLX,...), UV (2EUVE,EUVE,...), LXB (2013ApJS), V* (2012A&A,V*,...), SB* (SBC7,SBC9), gam (INTEGRAL1,INTREF), N* (2014MNRAS), N*? (2007ApJS), Ro* (2018AJ), blu (2021A&A), NIR (2MASS)
ICRS coord. (ep=J2000) : 		16 19 55.0692669024 -15 38 25.017666540 (Optical) [ 0.0205 0.0129 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		16 17 04.4828966919 -15 31 14.836367728 [ 0.0205 0.0129 90 ]
Gal coord. (ep=J2000) : 		359.0941818238605 +23.7843946654671 [ 0.0205 0.0129 90 ]
Proper motions mas/yr : 		-7.185 -12.332 [0.027 0.019 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -138.5 [~] / z(~) -0.000462 [~] / cz -138.47 [~]
   E 1995A&AS..114..269D
Parallaxes (mas): 		0.4297 [0.022] A 2020yCat.1350....0G
Spectral type: 		Oev E ~
Fluxes (7) :
U 11.60 [~] D 2007A&A...469..807L
B 12.40 [~] D 2007A&A...469..807L
V 11.1 [~] D 1995GCTP..C......0V
G 12.457144 [0.014054] C 2020yCat.1350....0G
J 11.907 [0.027] C 2003yCat.2246....0C
H 11.547 [0.026] C 2003yCat.2246....0C
K 11.147 [0.023] C 2003yCat.2246....0C
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1 : 7730 Display criteria :

Identifiers (40) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

X Sco XR-1 INTEGRAL1 21 RE J161956-153814 V* V818 Sco
2A 1616-155 INTREF 685 RE J1619-153 WEB 13546
3A 1617-155 KOHX 20 SBC7 569 1XRS 16170-155
EPIC 205703810 1M 1617-155 SBC9 895 XSS J16204-1536
2EUVE J1619-15.6 2MASS J16195506-1538250 SRGA J161954.6-153821 X Sco X-1
EUVE J1619-15.6 2MAXI J1619-155 SWIFT J1620.1-1539 [BM83] X1617-155
GALEX J161955.0-153825 PBC J1619.9-1538 TIC 52901460 [KRL2007b] 184
1H 1617-155 PLX 3702.01 2U 1617-15 AAVSO 1614-15
H 1620-15 2RE J161955-153824 3U 1617-15 Gaia DR3 4328198145165324800
H 1617-155 2RE J1619-153 4U 1617-15 Gaia DR2 4328198145165324800

References (1730 between 1850 and 2026) (Total 1730)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 1    Distance : 2    Var : 1    Plx : 3    PM : 2   

   

Observing logs
ISO : 11    IUE : 92    XMM : 7   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : V* V818 Sco

Link by name to the catalogue in VizieR :

EUVE J1619-15.6 GALEX J161955.0-153825 2MASS J16195506-1538250 2RE J161955-153824 2RE J1619-153
V* V818 Sco Gaia DR3 4328198145165324800 Gaia DR2 4328198145165324800

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