J/AJ/157/184 NY Virginis primary mid-eclipse times (Song+, 2019)
An updated model for circumbinary planets orbiting the sdB binary NY Virginis.
Song S., Mai X., Mutel R.L., Pulley D., Faillace G., Watkins A.
<Astron. J., 157, 184 (2019)>
=2019AJ....157..184S 2019AJ....157..184S (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Stars, subdwarf
Keywords: binaries: close - binaries: eclipsing -
stars: individual (NY Virginis)
Abstract:
We report 18 new primary minima timing observations of the short-period
eclipsing binary system NY Virginis. We combined these minima with
previously published primary minima to update circumbinary exoplanet
models in this system based on O-C timing variations. We performed a
nonlinear least-squares minimization search using a quadratic ephemeris
and either one or two exoplanets. The only model with an acceptable fit
includes a period derivative P=2.83x10-12 and two planets in eccentric
orbits e=0.15, 0.15 with minimum masses of 2.7 and 5.5 Jovian masses.
Analysis of the orbit stability shows that this solution is stable for
at least 108 years, but a small increase in eccentricity (e≥0.20)
for either planet renders the orbits unstable in less than 106 years.
A number of model parameters are significantly degenerate, so
additional observations are required to determine planetary parameters
with high statistical confidence.
Description:
We observed NY Vir at primary eclipse on 18 nights between 2018 January 24
and April 18. The observations were made with the 0.5 m telescope at
the Iowa Robotic observatory (http://astro.physics.uiowa.edu/iro), located
at Winer Observatory (http://winer.org/) in southeastern Arizona. We used
a SBIG 6303e CCD camera (2048x3072x12 micron pixels) and a Sloan r' filter.
At each epoch, we took a sequence (typically 20) of 15 s exposures centered
on the predicted time of primary eclipse.
Objects:
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RA (ICRS) DE Designation(s)
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13 38 48.15 -02 01 49.2 NY Virginis = V* NY Vir
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 36 106 NY Vir primary mid-eclipse times
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See also:
J/A+A/611/A48 : Seven sdB eclipsing binaries data (Pulley+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD [2450223.36202/2458236.85791] Observed eclipse
time of NY Vir (1)
16- 22 F7.5 d e_BJD [1e-05/0.00015] Uncertainty in BJD
24- 36 A13 --- Obs Observer/origin of the data (2)
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Note (1): These are Barycentric Julian Day of the observed minima. Data are
binned/revised. See details in the paper.
Note (2): Observer/origin of the data as follows:
AAVSO = American Association of Variable Star Observers
(http://www.aavso.org);
Basturk 2018 = 2018OAst...27...14B 2018OAst...27...14B;
Camurdan 2012 = 2012NewA...17..325C 2012NewA...17..325C;
Kilkenny 1998 = 1998MNRAS.296..329K 1998MNRAS.296..329K;
Kilkenny 2000 = 2000Obs...120...48K 2000Obs...120...48K;
Kilkenny 2011 = 2011MNRAS.412..487K 2011MNRAS.412..487K;
Kilkenny 2014 = 2014MNRAS.445.4247K 2014MNRAS.445.4247K;
Lee 2014 = 2014MNRAS.445.2331L 2014MNRAS.445.2331L;
Pulley 2016 = 2016JBAA..126..249P 2016JBAA..126..249P;
Qian 2012 = 2012ApJ...745L..23Q 2012ApJ...745L..23Q;
Song 2019 = This paper;
WASP = Wide Angle Search for Planets (Butters et al.
2010A&A...520L..10B 2010A&A...520L..10B).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 01-Aug-2019