A LOW STELLAR OBLIQUITY for WASP-47, A COMPACT MULTIPLANET SYSTEM with A HOT JUPITER and AN ULTRA-SHORT PERIOD PLANET

Roberto Sanchis-Ojeda; Joshua N. Winn; Fei Dai; Andrew W. Howard; Howard Isaacson; Geoffrey W. Marcy; Erik Petigura; Evan Sinukoff; Lauren Weiss; Simon Albrecht; Teruyuki Hirano; Leslie Rogers

doi:10.1088/2041-8205/812/1/L11

A LOW STELLAR OBLIQUITY for WASP-47, A COMPACT MULTIPLANET SYSTEM with A HOT JUPITER and AN ULTRA-SHORT PERIOD PLANET

Roberto Sanchis-Ojeda, Joshua N. Winn, Fei Dai, Andrew W. Howard, Howard Isaacson, Geoffrey W. Marcy, Erik Petigura, Evan Sinukoff, Lauren Weiss, Simon Albrecht, Teruyuki Hirano, Leslie Rogers

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

41 Scopus citations

Abstract

We have detected the Rossiter-Mclaughlin effect during a transit of WASP-47b, the only known hot Jupiter with close planetary companions. By combining our spectroscopic observations with Kepler photometry, we show that the projected stellar obliquity is λ = 0ï¿½ ï¿½ 24ï¿½. We can firmly exclude a retrograde orbit for WASP-47b, and rule out strongly misaligned prograde orbits. Low obliquities have also been found for most of the other compact multiplanet systems that have been investigated. The Kepler-56 system, with two close-in gas giants transiting their subgiant host star with an obliquity of at least 45, remains the only clear counterexample.

Original language	English (US)
Article number	L11
Journal	Astrophysical Journal Letters
Volume	812
Issue number	1
DOIs	https://doi.org/10.1088/2041-8205/812/1/L11
State	Published - Oct 10 2015
Externally published	Yes

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

planet-star interactions
planetary systems
planets and satellites: formation
stars: rotation

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10.1088/2041-8205/812/1/L11

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Sanchis-Ojeda, R., Winn, J. N., Dai, F., Howard, A. W., Isaacson, H., Marcy, G. W., Petigura, E., Sinukoff, E., Weiss, L., Albrecht, S., Hirano, T., & Rogers, L. (2015). A LOW STELLAR OBLIQUITY for WASP-47, A COMPACT MULTIPLANET SYSTEM with A HOT JUPITER and AN ULTRA-SHORT PERIOD PLANET. Astrophysical Journal Letters, 812(1), Article L11. https://doi.org/10.1088/2041-8205/812/1/L11

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title = "A LOW STELLAR OBLIQUITY for WASP-47, A COMPACT MULTIPLANET SYSTEM with A HOT JUPITER and AN ULTRA-SHORT PERIOD PLANET",

abstract = "We have detected the Rossiter-Mclaughlin effect during a transit of WASP-47b, the only known hot Jupiter with close planetary companions. By combining our spectroscopic observations with Kepler photometry, we show that the projected stellar obliquity is λ = 0{\"i}¿½ {\"i}¿½ 24{\"i}¿½. We can firmly exclude a retrograde orbit for WASP-47b, and rule out strongly misaligned prograde orbits. Low obliquities have also been found for most of the other compact multiplanet systems that have been investigated. The Kepler-56 system, with two close-in gas giants transiting their subgiant host star with an obliquity of at least 45, remains the only clear counterexample.",

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author = "Roberto Sanchis-Ojeda and Winn, {Joshua N.} and Fei Dai and Howard, {Andrew W.} and Howard Isaacson and Marcy, {Geoffrey W.} and Erik Petigura and Evan Sinukoff and Lauren Weiss and Simon Albrecht and Teruyuki Hirano and Leslie Rogers",

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doi = "10.1088/2041-8205/812/1/L11",

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T1 - A LOW STELLAR OBLIQUITY for WASP-47, A COMPACT MULTIPLANET SYSTEM with A HOT JUPITER and AN ULTRA-SHORT PERIOD PLANET

AU - Sanchis-Ojeda, Roberto

AU - Winn, Joshua N.

AU - Dai, Fei

AU - Howard, Andrew W.

AU - Isaacson, Howard

AU - Marcy, Geoffrey W.

AU - Petigura, Erik

AU - Sinukoff, Evan

AU - Weiss, Lauren

AU - Albrecht, Simon

AU - Hirano, Teruyuki

AU - Rogers, Leslie

PY - 2015/10/10

Y1 - 2015/10/10

N2 - We have detected the Rossiter-Mclaughlin effect during a transit of WASP-47b, the only known hot Jupiter with close planetary companions. By combining our spectroscopic observations with Kepler photometry, we show that the projected stellar obliquity is λ = 0ï¿½ ï¿½ 24ï¿½. We can firmly exclude a retrograde orbit for WASP-47b, and rule out strongly misaligned prograde orbits. Low obliquities have also been found for most of the other compact multiplanet systems that have been investigated. The Kepler-56 system, with two close-in gas giants transiting their subgiant host star with an obliquity of at least 45, remains the only clear counterexample.

AB - We have detected the Rossiter-Mclaughlin effect during a transit of WASP-47b, the only known hot Jupiter with close planetary companions. By combining our spectroscopic observations with Kepler photometry, we show that the projected stellar obliquity is λ = 0ï¿½ ï¿½ 24ï¿½. We can firmly exclude a retrograde orbit for WASP-47b, and rule out strongly misaligned prograde orbits. Low obliquities have also been found for most of the other compact multiplanet systems that have been investigated. The Kepler-56 system, with two close-in gas giants transiting their subgiant host star with an obliquity of at least 45, remains the only clear counterexample.

KW - planet-star interactions

KW - planetary systems

KW - planets and satellites: formation

KW - stars: rotation

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U2 - 10.1088/2041-8205/812/1/L11

DO - 10.1088/2041-8205/812/1/L11

M3 - Article

AN - SCOPUS:84946092507

SN - 2041-8205

VL - 812

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 1

M1 - L11

ER -

A LOW STELLAR OBLIQUITY for WASP-47, A COMPACT MULTIPLANET SYSTEM with A HOT JUPITER and AN ULTRA-SHORT PERIOD PLANET

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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