Mass and period limits on the ringed companion transiting the young star J1407

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 54 d. 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 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 masses greater than 80 M_Jup are ruled out at 3 sigma 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 68+-10 degrees.

20 pages, 15 figures, 12 tables, accepted by MNRAS

References in corpus (12)

• The Evolution of L and T Dwarfs in Color-Magnitude Diagrams
• The first WASP public data release
• A new list of thorium and argon spectral lines in the visible
• TW Hydrae: evidence of stellar spots instead of a Hot Jupiter
• The Disk Around CoKu Tau/4: Circumbinary, not Transitional
• Mapping the Shores of the Brown Dwarf Desert I.: Upper Scorpius
• A Stellar Census of the Tucana-Horologium Moving Group
• Formation of Regular Satellites from Ancient Massive Rings in the Solar System
• WASP-4b: a 12th-magnitude transiting hot-Jupiter in the Southern hemisphere
• In the Shadow of the Transiting Disk: Imaging epsilon Aurigae in Eclipse
• The Orbit and Occultations of KH 15D
• Dynamical Mass of GJ 802B: a brown dwarf in a triple system

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