2021RNAAS...5..139S

Query : 2021RNAAS...5..139S

2021RNAAS...5..139S - Research Notes of the AAS, 5, 139 (2021/June-0)

The Dwarf Nova V893 Sco Does Not Have a Giant Planet.

SCHAEFER B.E. and HAMBSCH F.-J.

Abstract (from CDS):

V893 Sco is an ordinary dwarf nova, with a narrow eclipse that allows for exact timings of minima. These eclipse times have been used to seek variations (compared to a linear ephemeris) by placement onto a traditional O - C diagram. Bruch collected 114 eclipse times from 1999 to 2013, and noted that the residuals in his O - C diagram had an apparent sinusoidal variation with a period of 10.2 yr. After rejecting a variety of possibilities, Bruch settled on the explanation that the binary was orbited by a planet with the mass of 9.5 Jupiters. We have tested this planet proposal by extending the O - C curve to 2014 and 2020-2021. For this, we measured 987 eclipse times in 2014 with the K2 mission, plus we measured 305 eclipse times in 2020 and 2021 with a remotely controlled observatory in the Atacama. We find that the O - C curve suffers a sharp break (from Bruch's sinewave) to a shorter period after 2013. Thus, the planet-hypothesis has failed.

Journal keyword(s): Cataclysmic variable stars

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* V893 Sco	CV*	16 15 14.9804783976	-28 37 32.113386876						~	95	0

Query : 2021RNAAS...5..139S

Basic data :

V* V893 Sco -- Cataclysmic Binary

X (1eRASS,1RXS,...), CV* (2020MNRAS), V* (V*), * (Gaia), NIR (2MASS)

16 15 14.9804783976 -28 37 32.113386876 (Optical) [ 0.0214 0.0122 90 ] A 2020yCat.1350....0G

16 12 08.8719821978 -28 30 00.717500993 [ 0.0214 0.0122 90 ]

348.0659540809539 +15.8828661102530 [ 0.0214 0.0122 90 ]

-52.902 -58.566 [0.028 0.019 90] A 2020yCat.1350....0G

8.0913 [0.025] A 2020yCat.1350....0G

G 14.560813 [0.016166] C 2020yCat.1350....0G

J 13.222 [0.026] C 2003yCat.2246....0C

H 12.908 [0.024] C 2003yCat.2246....0C

K 12.682 [0.030] C 2003yCat.2246....0C

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*`SV SVS 1772`**	`1RXS J161516.2-283712`	*`V V893 Sco`**	`Gaia DR3 6039131391540808832`
`1eRASS J161514.8-283732`	`SRGA J161515.4-283729`	`3XMM J161514.9-283733`	`Gaia DR2 6039131391540808832`
`2MASS J16151498-2837319`	`TIC 68693903`	`XSS J16167-2817`

References (95 between 1850 and 2026) (Total 95)
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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External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : V* V893 Sco

Link by name to the catalogue in VizieR :

2MASS J16151498-2837319 1RXS J161516.2-283712 V* V893 Sco Gaia DR3 6039131391540808832 Gaia DR2 6039131391540808832

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