NEID Rossiter-McLaughlin Measurement of TOI-1268b: A Young Warm Saturn Aligned with Its Cool Host Star

Jiayin Dong; Chelsea X. Huang; George Zhou; Rebekah I. Dawson; Gumundur K. Stefánsson; Chad F. Bender; Cullen H. Blake; Eric B. Ford; Samuel Halverson; Shubham Kanodia; Suvrath Mahadevan; Michael W. McElwain; Joe P. Ninan; Paul Robertson; Arpita Roy; Christian Schwab; Daniel J. Stevens; Ryan C. Terrien; Andrew Vanderburg; Adam L. Kraus; Stephanie Douglas; Elisabeth Newton; Rayna Rampalli; Daniel M. Krolikowski; Karen A. Collins; Joseph E. Rodriguez; Dax L. Feliz; Gregor Srdoc; Carl Ziegler; Khalid Barkaoui; Francisco J. Pozuelos; Emmanuel Jehin; C. Michaël; Zouhair Benkhaldoun; Pablo Lewin; Raquel Forés-Toribio; Jose A. Muñoz; Kim K. McLeod; Fiona Powers Özyurt; Ferran Grau Horta; Felipe Murgas; David W. Latham; Samuel N. Quinn; Allyson Bieryla; Steve B. Howell; Crystal L. Gnilka; David R. Ciardi; Michael B. Lund; Courtney D. Dressing; Steven Giacalone; Arjun B. Savel; Ivan A. Strakhov; Alexander A. Belinski; George R. Ricker; S. Seager; Joshua N. Winn; Jon M. Jenkins; Guillermo Torres; Martin Paegert

doi:10.3847/2041-8213/ac4da0

NEID Rossiter-McLaughlin Measurement of TOI-1268b: A Young Warm Saturn Aligned with Its Cool Host Star

Jiayin Dong, Chelsea X. Huang, George Zhou, Rebekah I. Dawson, Gumundur K. Stefánsson, Chad F. Bender, Cullen H. Blake, Eric B. Ford, Samuel Halverson, Shubham Kanodia, Suvrath Mahadevan, Michael W. McElwain, Joe P. Ninan, Paul Robertson, Arpita Roy, Christian Schwab, Daniel J. Stevens, Ryan C. Terrien, Andrew Vanderburg, Adam L. KrausStephanie Douglas, Elisabeth Newton, Rayna Rampalli, Daniel M. Krolikowski, Karen A. Collins, Joseph E. Rodriguez, Dax L. Feliz, Gregor Srdoc, Carl Ziegler, Khalid Barkaoui, Francisco J. Pozuelos, Emmanuel Jehin, C. Michaël, Zouhair Benkhaldoun, Pablo Lewin, Raquel Forés-Toribio, Jose A. Muñoz, Kim K. McLeod, Fiona Powers Özyurt, Ferran Grau Horta, Felipe Murgas, David W. Latham, Samuel N. Quinn, Allyson Bieryla, Steve B. Howell, Crystal L. Gnilka, David R. Ciardi, Michael B. Lund, Courtney D. Dressing, Steven Giacalone, Arjun B. Savel, Ivan A. Strakhov, Alexander A. Belinski, George R. Ricker, S. Seager, Joshua N. Winn, Jon M. Jenkins, Guillermo Torres, Martin Paegert

Astrophysical Sciences

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Abstract

Close-in gas giants present a surprising range of stellar obliquity, the angle between a planet's orbital axis and its host star's spin axis. It is unclear whether the obliquities reflect the planets' dynamical history (e.g., aligned for in situ formation or disk migration versus misaligned for high-eccentricity tidal migration) or whether other mechanisms (e.g., primordial misalignment or planet-star interactions) are more important in sculpting the obliquity distribution. Here we present the stellar obliquity measurement of TOI-1268 (TIC-142394656, V mag ∼10.9), a young K-type dwarf hosting an 8.2 day period, Saturn-sized planet. TOI-1268's lithium abundance and rotation period suggest the system age between the ages of the Pleiades cluster (∼120 Myr) and the Prasepe cluster (∼670 Myr). Using the newly commissioned NEID spectrograph, we constrain the stellar obliquity of TOI-1268 via the Rossiter-McLaughlin effect from both radial velocity and Doppler tomography signals. The 3σ upper bounds of the projected stellar obliquity λ from both models are below 60°. The large host star separation (a/R ∗ ∼17), combined with the system's young age, makes it unlikely that the planet has realigned its host star. The stellar obliquity measurement of TOI-1268 probes the architecture of a young gas giant beyond the reach of tidal realignment (a/R ∗ ≲10) and reveals an aligned or slightly misaligned system.

Original language	English (US)
Article number	L7
Journal	Astrophysical Journal Letters
Volume	926
Issue number	2
DOIs	https://doi.org/10.3847/2041-8213/ac4da0
State	Published - Feb 1 2022

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/2041-8213/ac4da0

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Dong, J., Huang, C. X., Zhou, G., Dawson, R. I., Stefánsson, G. K., Bender, C. F., Blake, C. H., Ford, E. B., Halverson, S., Kanodia, S., Mahadevan, S., McElwain, M. W., Ninan, J. P., Robertson, P., Roy, A., Schwab, C., Stevens, D. J., Terrien, R. C., Vanderburg, A., ... Paegert, M. (2022). NEID Rossiter-McLaughlin Measurement of TOI-1268b: A Young Warm Saturn Aligned with Its Cool Host Star. Astrophysical Journal Letters, 926(2), Article L7. https://doi.org/10.3847/2041-8213/ac4da0

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title = "NEID Rossiter-McLaughlin Measurement of TOI-1268b: A Young Warm Saturn Aligned with Its Cool Host Star",

abstract = "Close-in gas giants present a surprising range of stellar obliquity, the angle between a planet's orbital axis and its host star's spin axis. It is unclear whether the obliquities reflect the planets' dynamical history (e.g., aligned for in situ formation or disk migration versus misaligned for high-eccentricity tidal migration) or whether other mechanisms (e.g., primordial misalignment or planet-star interactions) are more important in sculpting the obliquity distribution. Here we present the stellar obliquity measurement of TOI-1268 (TIC-142394656, V mag ∼10.9), a young K-type dwarf hosting an 8.2 day period, Saturn-sized planet. TOI-1268's lithium abundance and rotation period suggest the system age between the ages of the Pleiades cluster (∼120 Myr) and the Prasepe cluster (∼670 Myr). Using the newly commissioned NEID spectrograph, we constrain the stellar obliquity of TOI-1268 via the Rossiter-McLaughlin effect from both radial velocity and Doppler tomography signals. The 3σ upper bounds of the projected stellar obliquity λ from both models are below 60°. The large host star separation (a/R ∗ ∼17), combined with the system's young age, makes it unlikely that the planet has realigned its host star. The stellar obliquity measurement of TOI-1268 probes the architecture of a young gas giant beyond the reach of tidal realignment (a/R ∗ ≲10) and reveals an aligned or slightly misaligned system.",

author = "Jiayin Dong and Huang, {Chelsea X.} and George Zhou and Dawson, {Rebekah I.} and Stef{\'a}nsson, {Gumundur K.} and Bender, {Chad F.} and Blake, {Cullen H.} and Ford, {Eric B.} and Samuel Halverson and Shubham Kanodia and Suvrath Mahadevan and McElwain, {Michael W.} and Ninan, {Joe P.} and Paul Robertson and Arpita Roy and Christian Schwab and Stevens, {Daniel J.} and Terrien, {Ryan C.} and Andrew Vanderburg and Kraus, {Adam L.} and Stephanie Douglas and Elisabeth Newton and Rayna Rampalli and Krolikowski, {Daniel M.} and Collins, {Karen A.} and Rodriguez, {Joseph E.} and Feliz, {Dax L.} and Gregor Srdoc and Carl Ziegler and Khalid Barkaoui and Pozuelos, {Francisco J.} and Emmanuel Jehin and C. Micha{\"e}l and Zouhair Benkhaldoun and Pablo Lewin and Raquel For{\'e}s-Toribio and Mu{\~n}oz, {Jose A.} and McLeod, {Kim K.} and {\"O}zyurt, {Fiona Powers} and Horta, {Ferran Grau} and Felipe Murgas and Latham, {David W.} and Quinn, {Samuel N.} and Allyson Bieryla and Howell, {Steve B.} and Gnilka, {Crystal L.} and Ciardi, {David R.} and Lund, {Michael B.} and Dressing, {Courtney D.} and Steven Giacalone and Savel, {Arjun B.} and Strakhov, {Ivan A.} and Belinski, {Alexander A.} and Ricker, {George R.} and S. Seager and Winn, {Joshua N.} and Jenkins, {Jon M.} and Guillermo Torres and Martin Paegert",

note = "Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",

year = "2022",

month = feb,

day = "1",

doi = "10.3847/2041-8213/ac4da0",

language = "English (US)",

volume = "926",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "IOP Publishing Ltd.",

number = "2",

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Dong, J, Huang, CX, Zhou, G, Dawson, RI, Stefánsson, GK, Bender, CF, Blake, CH, Ford, EB, Halverson, S, Kanodia, S, Mahadevan, S, McElwain, MW, Ninan, JP, Robertson, P, Roy, A, Schwab, C, Stevens, DJ, Terrien, RC, Vanderburg, A, Kraus, AL, Douglas, S, Newton, E, Rampalli, R, Krolikowski, DM, Collins, KA, Rodriguez, JE, Feliz, DL, Srdoc, G, Ziegler, C, Barkaoui, K, Pozuelos, FJ, Jehin, E, Michaël, C, Benkhaldoun, Z, Lewin, P, Forés-Toribio, R, Muñoz, JA, McLeod, KK, Özyurt, FP, Horta, FG, Murgas, F, Latham, DW, Quinn, SN, Bieryla, A, Howell, SB, Gnilka, CL, Ciardi, DR, Lund, MB, Dressing, CD, Giacalone, S, Savel, AB, Strakhov, IA, Belinski, AA, Ricker, GR, Seager, S, Winn, JN, Jenkins, JM, Torres, G & Paegert, M 2022, 'NEID Rossiter-McLaughlin Measurement of TOI-1268b: A Young Warm Saturn Aligned with Its Cool Host Star', Astrophysical Journal Letters, vol. 926, no. 2, L7. https://doi.org/10.3847/2041-8213/ac4da0

TY - JOUR

T1 - NEID Rossiter-McLaughlin Measurement of TOI-1268b

T2 - A Young Warm Saturn Aligned with Its Cool Host Star

AU - Dong, Jiayin

AU - Huang, Chelsea X.

AU - Zhou, George

AU - Dawson, Rebekah I.

AU - Stefánsson, Gumundur K.

AU - Bender, Chad F.

AU - Blake, Cullen H.

AU - Ford, Eric B.

AU - Halverson, Samuel

AU - Kanodia, Shubham

AU - Mahadevan, Suvrath

AU - McElwain, Michael W.

AU - Ninan, Joe P.

AU - Robertson, Paul

AU - Roy, Arpita

AU - Schwab, Christian

AU - Stevens, Daniel J.

AU - Terrien, Ryan C.

AU - Vanderburg, Andrew

AU - Kraus, Adam L.

AU - Douglas, Stephanie

AU - Newton, Elisabeth

AU - Rampalli, Rayna

AU - Krolikowski, Daniel M.

AU - Collins, Karen A.

AU - Rodriguez, Joseph E.

AU - Feliz, Dax L.

AU - Srdoc, Gregor

AU - Ziegler, Carl

AU - Barkaoui, Khalid

AU - Pozuelos, Francisco J.

AU - Jehin, Emmanuel

AU - Michaël, C.

AU - Benkhaldoun, Zouhair

AU - Lewin, Pablo

AU - Forés-Toribio, Raquel

AU - Muñoz, Jose A.

AU - McLeod, Kim K.

AU - Özyurt, Fiona Powers

AU - Horta, Ferran Grau

AU - Murgas, Felipe

AU - Latham, David W.

AU - Quinn, Samuel N.

AU - Bieryla, Allyson

AU - Howell, Steve B.

AU - Gnilka, Crystal L.

AU - Ciardi, David R.

AU - Lund, Michael B.

AU - Dressing, Courtney D.

AU - Giacalone, Steven

AU - Savel, Arjun B.

AU - Strakhov, Ivan A.

AU - Belinski, Alexander A.

AU - Ricker, George R.

AU - Seager, S.

AU - Winn, Joshua N.

AU - Jenkins, Jon M.

AU - Torres, Guillermo

AU - Paegert, Martin

PY - 2022/2/1

Y1 - 2022/2/1

N2 - Close-in gas giants present a surprising range of stellar obliquity, the angle between a planet's orbital axis and its host star's spin axis. It is unclear whether the obliquities reflect the planets' dynamical history (e.g., aligned for in situ formation or disk migration versus misaligned for high-eccentricity tidal migration) or whether other mechanisms (e.g., primordial misalignment or planet-star interactions) are more important in sculpting the obliquity distribution. Here we present the stellar obliquity measurement of TOI-1268 (TIC-142394656, V mag ∼10.9), a young K-type dwarf hosting an 8.2 day period, Saturn-sized planet. TOI-1268's lithium abundance and rotation period suggest the system age between the ages of the Pleiades cluster (∼120 Myr) and the Prasepe cluster (∼670 Myr). Using the newly commissioned NEID spectrograph, we constrain the stellar obliquity of TOI-1268 via the Rossiter-McLaughlin effect from both radial velocity and Doppler tomography signals. The 3σ upper bounds of the projected stellar obliquity λ from both models are below 60°. The large host star separation (a/R ∗ ∼17), combined with the system's young age, makes it unlikely that the planet has realigned its host star. The stellar obliquity measurement of TOI-1268 probes the architecture of a young gas giant beyond the reach of tidal realignment (a/R ∗ ≲10) and reveals an aligned or slightly misaligned system.

AB - Close-in gas giants present a surprising range of stellar obliquity, the angle between a planet's orbital axis and its host star's spin axis. It is unclear whether the obliquities reflect the planets' dynamical history (e.g., aligned for in situ formation or disk migration versus misaligned for high-eccentricity tidal migration) or whether other mechanisms (e.g., primordial misalignment or planet-star interactions) are more important in sculpting the obliquity distribution. Here we present the stellar obliquity measurement of TOI-1268 (TIC-142394656, V mag ∼10.9), a young K-type dwarf hosting an 8.2 day period, Saturn-sized planet. TOI-1268's lithium abundance and rotation period suggest the system age between the ages of the Pleiades cluster (∼120 Myr) and the Prasepe cluster (∼670 Myr). Using the newly commissioned NEID spectrograph, we constrain the stellar obliquity of TOI-1268 via the Rossiter-McLaughlin effect from both radial velocity and Doppler tomography signals. The 3σ upper bounds of the projected stellar obliquity λ from both models are below 60°. The large host star separation (a/R ∗ ∼17), combined with the system's young age, makes it unlikely that the planet has realigned its host star. The stellar obliquity measurement of TOI-1268 probes the architecture of a young gas giant beyond the reach of tidal realignment (a/R ∗ ≲10) and reveals an aligned or slightly misaligned system.

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DO - 10.3847/2041-8213/ac4da0

M3 - Article

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SN - 2041-8205

VL - 926

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L7

ER -

NEID Rossiter-McLaughlin Measurement of TOI-1268b: A Young Warm Saturn Aligned with Its Cool Host Star

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