THE PTF orion project: A possible planet transiting a T-Tauri star

Julian C. Van Eyken; David R. Ciardi; Kaspar Von Braun; Stephen R. Kane; Peter Plavchan; Chad F. Bender; Timothy M. Brown; Justin R. Crepp; Benjamin J. Fulton; Andrew W. Howard; Steve B. Howell; Suvrath Mahadevan; Geoffrey W. Marcy; Avi Shporer; Paula Szkody; Rachel L. Akeson; Charles A. Beichman; Andrew F. Boden; Dawn M. Gelino; D. W. Hoard; Solange V. Ramírez; Luisa M. Rebull; John R. Stauffer; Joshua S. Bloom; S. Bradley Cenko; Mansi M. Kasliwal; Shrinivas R. Kulkarni; Nicholas M. Law; Peter E. Nugent; Eran O. Ofek; Dovi Poznanski; Robert M. Quimby; Richard Walters; Carl J. Grillmair; Russ Laher; David B. Levitan; Branimir Sesar; Jason A. Surace

doi:10.1088/0004-637X/755/1/42

THE PTF orion project: A possible planet transiting a T-Tauri star

Julian C. Van Eyken, David R. Ciardi, Kaspar Von Braun, Stephen R. Kane, Peter Plavchan, Chad F. Bender, Timothy M. Brown, Justin R. Crepp, Benjamin J. Fulton, Andrew W. Howard, Steve B. Howell, Suvrath Mahadevan, Geoffrey W. Marcy, Avi Shporer, Paula Szkody, Rachel L. Akeson, Charles A. Beichman, Andrew F. Boden, Dawn M. Gelino, D. W. HoardSolange V. Ramírez, Luisa M. Rebull, John R. Stauffer, Joshua S. Bloom, S. Bradley Cenko, Mansi M. Kasliwal, Shrinivas R. Kulkarni, Nicholas M. Law, Peter E. Nugent, Eran O. Ofek, Dovi Poznanski, Robert M. Quimby, Richard Walters, Carl J. Grillmair, Russ Laher, David B. Levitan, Branimir Sesar, Jason A. Surace

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Abstract

We report observations of a possible young transiting planet orbiting a previously known weak-lined T-Tauri star in the 7-10 Myr old Orion-OB1a/25-Ori region. The candidate was found as part of the Palomar Transient Factory (PTF) Orion project. It has a photometric transit period of 0.448413 ± 0.000040 days, and appears in both 2009 and 2010 PTF data. Follow-up low-precision radial velocity (RV) observations and adaptive optics imaging suggest that the star is not an eclipsing binary, and that it is unlikely that a background source is blended with the target and mimicking the observed transit. RV observations with the Hobby-Eberly and Keck telescopes yield an RV that has the same period as the photometric event, but is offset in phase from the transit center by - 0.22 periods. The amplitude (half range) of the RV variations is 2.4 km s^-1 and is comparable with the expected RV amplitude that stellar spots could induce. The RV curve is likely dominated by stellar spot modulation and provides an upper limit to the projected companion mass of M _psin i _orb ≲ 4.8 ± 1.2 M _Jup; when combined with the orbital inclination, i _orb, of the candidate planet from modeling of the transit light curve, we find an upper limit on the mass of the planetary candidate of M _p ≲ 5.5 ± 1.4 M _Jup. This limit implies that the planet is orbiting close to, if not inside, its Roche limiting orbital radius, so that it may be undergoing active mass loss and evaporation.

Original language	English (US)
Article number	42
Journal	Astrophysical Journal
Volume	755
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/755/1/42
State	Published - Aug 10 2012

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-637X/755/1/42

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Van Eyken, J. C., Ciardi, D. R., Von Braun, K., Kane, S. R., Plavchan, P., Bender, C. F., Brown, T. M., Crepp, J. R., Fulton, B. J., Howard, A. W., Howell, S. B., Mahadevan, S., Marcy, G. W., Shporer, A., Szkody, P., Akeson, R. L., Beichman, C. A., Boden, A. F., Gelino, D. M., ... Surace, J. A. (2012). THE PTF orion project: A possible planet transiting a T-Tauri star. Astrophysical Journal, 755(1), Article 42. https://doi.org/10.1088/0004-637X/755/1/42

@article{fde4e371c9a245779ea0ac128cefba23,

title = "THE PTF orion project: A possible planet transiting a T-Tauri star",

abstract = "We report observations of a possible young transiting planet orbiting a previously known weak-lined T-Tauri star in the 7-10 Myr old Orion-OB1a/25-Ori region. The candidate was found as part of the Palomar Transient Factory (PTF) Orion project. It has a photometric transit period of 0.448413 ± 0.000040 days, and appears in both 2009 and 2010 PTF data. Follow-up low-precision radial velocity (RV) observations and adaptive optics imaging suggest that the star is not an eclipsing binary, and that it is unlikely that a background source is blended with the target and mimicking the observed transit. RV observations with the Hobby-Eberly and Keck telescopes yield an RV that has the same period as the photometric event, but is offset in phase from the transit center by - 0.22 periods. The amplitude (half range) of the RV variations is 2.4 km s-1 and is comparable with the expected RV amplitude that stellar spots could induce. The RV curve is likely dominated by stellar spot modulation and provides an upper limit to the projected companion mass of M psin i orb ≲ 4.8 ± 1.2 M Jup; when combined with the orbital inclination, i orb, of the candidate planet from modeling of the transit light curve, we find an upper limit on the mass of the planetary candidate of M p ≲ 5.5 ± 1.4 M Jup. This limit implies that the planet is orbiting close to, if not inside, its Roche limiting orbital radius, so that it may be undergoing active mass loss and evaporation.",

author = "{Van Eyken}, {Julian C.} and Ciardi, {David R.} and {Von Braun}, Kaspar and Kane, {Stephen R.} and Peter Plavchan and Bender, {Chad F.} and Brown, {Timothy M.} and Crepp, {Justin R.} and Fulton, {Benjamin J.} and Howard, {Andrew W.} and Howell, {Steve B.} and Suvrath Mahadevan and Marcy, {Geoffrey W.} and Avi Shporer and Paula Szkody and Akeson, {Rachel L.} and Beichman, {Charles A.} and Boden, {Andrew F.} and Gelino, {Dawn M.} and Hoard, {D. W.} and Ram{\'i}rez, {Solange V.} and Rebull, {Luisa M.} and Stauffer, {John R.} and Bloom, {Joshua S.} and Cenko, {S. Bradley} and Kasliwal, {Mansi M.} and Kulkarni, {Shrinivas R.} and Law, {Nicholas M.} and Nugent, {Peter E.} and Ofek, {Eran O.} and Dovi Poznanski and Quimby, {Robert M.} and Richard Walters and Grillmair, {Carl J.} and Russ Laher and Levitan, {David B.} and Branimir Sesar and Surace, {Jason A.}",

year = "2012",

month = aug,

day = "10",

doi = "10.1088/0004-637X/755/1/42",

language = "English (US)",

volume = "755",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1",

}

Van Eyken, JC, Ciardi, DR, Von Braun, K, Kane, SR, Plavchan, P, Bender, CF, Brown, TM, Crepp, JR, Fulton, BJ, Howard, AW, Howell, SB, Mahadevan, S, Marcy, GW, Shporer, A, Szkody, P, Akeson, RL, Beichman, CA, Boden, AF, Gelino, DM, Hoard, DW, Ramírez, SV, Rebull, LM, Stauffer, JR, Bloom, JS, Cenko, SB, Kasliwal, MM, Kulkarni, SR, Law, NM, Nugent, PE, Ofek, EO, Poznanski, D, Quimby, RM, Walters, R, Grillmair, CJ, Laher, R, Levitan, DB, Sesar, B & Surace, JA 2012, 'THE PTF orion project: A possible planet transiting a T-Tauri star', Astrophysical Journal, vol. 755, no. 1, 42. https://doi.org/10.1088/0004-637X/755/1/42

TY - JOUR

T1 - THE PTF orion project

T2 - A possible planet transiting a T-Tauri star

AU - Van Eyken, Julian C.

AU - Ciardi, David R.

AU - Von Braun, Kaspar

AU - Kane, Stephen R.

AU - Plavchan, Peter

AU - Bender, Chad F.

AU - Brown, Timothy M.

AU - Crepp, Justin R.

AU - Fulton, Benjamin J.

AU - Howard, Andrew W.

AU - Howell, Steve B.

AU - Mahadevan, Suvrath

AU - Marcy, Geoffrey W.

AU - Shporer, Avi

AU - Szkody, Paula

AU - Akeson, Rachel L.

AU - Beichman, Charles A.

AU - Boden, Andrew F.

AU - Gelino, Dawn M.

AU - Hoard, D. W.

AU - Ramírez, Solange V.

AU - Rebull, Luisa M.

AU - Stauffer, John R.

AU - Bloom, Joshua S.

AU - Cenko, S. Bradley

AU - Kasliwal, Mansi M.

AU - Kulkarni, Shrinivas R.

AU - Law, Nicholas M.

AU - Nugent, Peter E.

AU - Ofek, Eran O.

AU - Poznanski, Dovi

AU - Quimby, Robert M.

AU - Walters, Richard

AU - Grillmair, Carl J.

AU - Laher, Russ

AU - Levitan, David B.

AU - Sesar, Branimir

AU - Surace, Jason A.

PY - 2012/8/10

Y1 - 2012/8/10

N2 - We report observations of a possible young transiting planet orbiting a previously known weak-lined T-Tauri star in the 7-10 Myr old Orion-OB1a/25-Ori region. The candidate was found as part of the Palomar Transient Factory (PTF) Orion project. It has a photometric transit period of 0.448413 ± 0.000040 days, and appears in both 2009 and 2010 PTF data. Follow-up low-precision radial velocity (RV) observations and adaptive optics imaging suggest that the star is not an eclipsing binary, and that it is unlikely that a background source is blended with the target and mimicking the observed transit. RV observations with the Hobby-Eberly and Keck telescopes yield an RV that has the same period as the photometric event, but is offset in phase from the transit center by - 0.22 periods. The amplitude (half range) of the RV variations is 2.4 km s-1 and is comparable with the expected RV amplitude that stellar spots could induce. The RV curve is likely dominated by stellar spot modulation and provides an upper limit to the projected companion mass of M psin i orb ≲ 4.8 ± 1.2 M Jup; when combined with the orbital inclination, i orb, of the candidate planet from modeling of the transit light curve, we find an upper limit on the mass of the planetary candidate of M p ≲ 5.5 ± 1.4 M Jup. This limit implies that the planet is orbiting close to, if not inside, its Roche limiting orbital radius, so that it may be undergoing active mass loss and evaporation.

AB - We report observations of a possible young transiting planet orbiting a previously known weak-lined T-Tauri star in the 7-10 Myr old Orion-OB1a/25-Ori region. The candidate was found as part of the Palomar Transient Factory (PTF) Orion project. It has a photometric transit period of 0.448413 ± 0.000040 days, and appears in both 2009 and 2010 PTF data. Follow-up low-precision radial velocity (RV) observations and adaptive optics imaging suggest that the star is not an eclipsing binary, and that it is unlikely that a background source is blended with the target and mimicking the observed transit. RV observations with the Hobby-Eberly and Keck telescopes yield an RV that has the same period as the photometric event, but is offset in phase from the transit center by - 0.22 periods. The amplitude (half range) of the RV variations is 2.4 km s-1 and is comparable with the expected RV amplitude that stellar spots could induce. The RV curve is likely dominated by stellar spot modulation and provides an upper limit to the projected companion mass of M psin i orb ≲ 4.8 ± 1.2 M Jup; when combined with the orbital inclination, i orb, of the candidate planet from modeling of the transit light curve, we find an upper limit on the mass of the planetary candidate of M p ≲ 5.5 ± 1.4 M Jup. This limit implies that the planet is orbiting close to, if not inside, its Roche limiting orbital radius, so that it may be undergoing active mass loss and evaporation.

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UR - http://www.scopus.com/inward/citedby.url?scp=84864458651&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/755/1/42

DO - 10.1088/0004-637X/755/1/42

M3 - Article

AN - SCOPUS:84864458651

SN - 0004-637X

VL - 755

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 42

ER -

THE PTF orion project: A possible planet transiting a T-Tauri star

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