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

M. A. Kenworthy; S. Lacour; A. Kraus; A. H.M.J. Triaud; E. E. Mamajek; E. L. Scott; D. Ségransan; M. Ireland; F. J. Hambsch; D. E. Reichart; J. B. Haislip; A. P. Lacluyze; J. P. Moore; N. R. Frank

doi:10.1093/mnras/stu2067

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

M. A. Kenworthy^*, S. Lacour, A. Kraus, A. H.M.J. Triaud, E. E. Mamajek, E. L. Scott, D. Ségransan, M. Ireland, F. J. Hambsch, D. E. Reichart, J. B. Haislip, A. P. Lacluyze, J. P. Moore, N. R. Frank

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

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 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 (α ≃ 2.2-5.6 au), and stellar masses (>80M_Jup) 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°.

Original language	English
Pages (from-to)	411-427
Number of pages	17
Journal	Monthly Notices of the Royal Astronomical Society
Volume	446
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stu2067
Publication status	Published - 1 Jan 2015

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Kenworthy, M. A., Lacour, S., Kraus, A., Triaud, A. H. M. J., Mamajek, E. E., Scott, E. L., Ségransan, D., Ireland, M., Hambsch, F. J., Reichart, D. E., Haislip, J. B., Lacluyze, A. P., Moore, J. P., & Frank, N. R. (2015). Mass and period limits on the ringed companion transiting the young star J1407. Monthly Notices of the Royal Astronomical Society, 446(1), 411-427. https://doi.org/10.1093/mnras/stu2067

@article{f4d56f9cf9f844b290495734f5c3a7c6,

title = "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 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 (α ≃ 2.2-5.6 au), and stellar masses (>80MJup) 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°.",

keywords = "Binaries: eclipsing, Planetary systems, Planets and satellites: formation, Planets and satellites: rings, Stars: individual: 1SWASP J140747.93-394542.6 (ASAS J140748-3945.7)",

author = "Kenworthy, {M. A.} and S. Lacour and A. Kraus and Triaud, {A. H.M.J.} and Mamajek, {E. E.} and Scott, {E. L.} and D. S{\'e}gransan and M. Ireland and Hambsch, {F. J.} and Reichart, {D. E.} and Haislip, {J. B.} and Lacluyze, {A. P.} and Moore, {J. P.} and Frank, {N. R.}",

note = "Publisher Copyright: {\textcopyright} 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.",

year = "2015",

month = jan,

day = "1",

doi = "10.1093/mnras/stu2067",

language = "English",

volume = "446",

pages = "411--427",

journal = "Monthly Notices of the Royal Astronomical Society",

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Kenworthy, MA, Lacour, S, Kraus, A, Triaud, AHMJ, Mamajek, EE, Scott, EL, Ségransan, D, Ireland, M, Hambsch, FJ, Reichart, DE, Haislip, JB, Lacluyze, AP, Moore, JP & Frank, NR 2015, 'Mass and period limits on the ringed companion transiting the young star J1407', Monthly Notices of the Royal Astronomical Society, vol. 446, no. 1, pp. 411-427. https://doi.org/10.1093/mnras/stu2067

TY - JOUR

T1 - Mass and period limits on the ringed companion transiting the young star J1407

AU - Kenworthy, M. A.

AU - Lacour, S.

AU - Kraus, A.

AU - Triaud, A. H.M.J.

AU - Mamajek, E. E.

AU - Scott, E. L.

AU - Ségransan, D.

AU - Ireland, M.

AU - Hambsch, F. J.

AU - Reichart, D. E.

AU - Haislip, J. B.

AU - Lacluyze, A. P.

AU - Moore, J. P.

AU - Frank, N. R.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - 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 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 (α ≃ 2.2-5.6 au), and stellar masses (>80MJup) 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°.

AB - 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 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 (α ≃ 2.2-5.6 au), and stellar masses (>80MJup) 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°.

KW - Binaries: eclipsing

KW - Planetary systems

KW - Planets and satellites: formation

KW - Planets and satellites: rings

KW - Stars: individual: 1SWASP J140747.93-394542.6 (ASAS J140748-3945.7)

UR - http://www.scopus.com/inward/record.url?scp=84924486871&partnerID=8YFLogxK

U2 - 10.1093/mnras/stu2067

DO - 10.1093/mnras/stu2067

M3 - Article

SN - 0035-8711

VL - 446

SP - 411

EP - 427

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

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

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