J/MNRAS/446/411 V lightcurves of J1407 from PROMPT-4 and ROAD (Kenworthy+, 2015)
Mass and period limits on the ringed companion transiting the young star J1407.
Kenworthy M.A., Lacour S., Kraus A., Triaud A.H.M.J., Mamajek E.E.,
Scott E.L., Segransan D., Ireland M., Hambsch F.-J., Reichart D.E.,
Haislip J.B., LaCluyze A.P., Moore J.P., Frank N.R.
<Mon. Not. R. Astron. Soc., 446, 411-427 (2015)>
=2015MNRAS.446..411K 2015MNRAS.446..411K (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence ; Photometry, VRI ; Binaries, eclipsing
Keywords: planets and satellites: formation - planets and satellites: rings -
binaries: eclipsing -
stars: individual: 1SWASP J140747.93-394542.6 (ASAS J140748-3945.7) -
planetary systems
Abstract:
The young (∼16 Myr) pre-main-sequence star in Sco-Cen
1SWASP J140747.93-394542.6, hereafter referred to as J1407, underwent
a deep eclipse in 2007 April, bracketed by several shallower eclipses
in the surrounding 54d. This has been interpreted as the first
detection of an eclipsing ring system circling a substellar object
(dubbed J1407b). We report on a search for this companion with Sparse
Aperture Mask imaging and direct imaging with both the UT4 VLT and
Keck telescopes. Radial velocity measurements of J1407 provide
additional constraints on J1407b and on short period companions to the
central star. Follow-up photometric monitoring using the Panchromatic
Robotic Optical Monitoring and Polarimetry Telescopes (PROMPT)-4 and
ROAD observatories during 2012-2014 has not yielded any additional
eclipses. Large regions of mass-period space are ruled out for the
companion. For circular orbits the companion period is constrained to
the range 3.5-13.8 yr (a∼2.2-5.6 au), and stellar masses (>80 MJup)
are ruled out at 3σ significance over these periods. The complex
ring system appears to occupy more than 0.15 of its Hill radius, much
larger than its Roche radius and suggesting a ring structure in
transition. Further, we demonstrate that the radial velocity of J1407
is consistent with membership in the Upper Cen-Lup subgroup of the
Sco-Cen association, and constraints on the rotation period and
projected rotational velocity of J1407 are consistent with a stellar
inclination of i*∼68°±10°.
Description:
The brightness of J1407 has been monitored nearly nightly between
2012 June and 2014 June, when possible, with the PROMPT-4 telescope at
CTIO (Reichart et al. 2005, Nuovo Cimento C, 28, 767). Three exposures
of 3 s each are taken per clear night in both V and I filters.
Nightly observations of J1407 (http://www.aavso.org/apass) have been
taken at the ROAD (Hambsch 2012, J. Am. Assoc. Var. Star Obs., 40, 1003)
observatory in Chile, using a commercially available CCD camera
from Finger Lakes Instrumentation (http://www.flicamera.com/), an FLI
ML16803 CCD, The Microline (ML) line of CCD cameras is a lightweight
camera design which can hold a variety of CCD chips.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
14 07 47.93 -39 45 42.8 J1407 = ASAS J140748-3945.7
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table8.dat 23 330 A sample of the photometry from the PROMPT-4
telescope.
table9.dat 26 1122 A sample of the photometry from the ROAD
observatory.
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See also:
J/A+A/216/44 : Walraven photometry in Sco-Cen association (De Geus+, 1989)
J/ApJS/82/117 : UBV and H-beta in Sco-Cen association (Slawson+, 1992)
J/A+A/356/541 : T Tauri stars in the Sco-Cen OB association (Koehler+, 2000)
Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 10 F10.5 d HJD Heliocentric Julian date (HJD-2450000)
12- 17 F6.3 mag Vmag CTIO V-band magnitude
19- 23 F5.3 mag e_Vmag Uncertainty in Vmag
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian date
15- 20 F6.3 mag Vmag ROAD V-band magnitude
22- 26 F5.3 mag e_Vmag Uncertainty in Vmag
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History:
From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 25-Oct-2017