A transit timing variation observed for the long-period extremely low density exoplanet HIP 41378f

Edward M. Bryant; Daniel Bayliss; Alexandre Santerne; Peter J. Wheatley; Valerio Nascimbeni; Elsa Ducrot; Artem Burdanov; Jack S. Acton; Douglas R. Alves; David R. Anderson; David J. Armstrong; Supachai Awiphan; Benjamin F. Cooke; Matthew R. Burleigh; Sarah L. Casewell; Laetitia Delrez; Brice-Olivier Demory; Philipp Eigmüller; Akihiko Fukui; Tianjun Gan; Samuel Gill; Michael Gillon; Michael R. Goad; Thiam-Guan Tan; Maximilian N. Günther; Bronwen Hardee; Beth A. Henderson; Emmanuel Jehin; James S. Jenkins; Molly Kosiarek; Monika Lendl; Maximiliano Moyano; Catriona A. Murray; Norio Narita; Prajwal Niraula; Caroline E. Odden; Enric Palle; Hannu Parviainen; Peter P. Pedersen; Francisco J. Pozuelos; Benjamin V. Rackham; Daniel Sebastian; Chris Stockdale; Rosanna H. Tilbrook; Samantha J. Thompson; Amaury H. M. J. Triaud; Stéphane Udry; Jose I. Vines; Richard G. West; Julien de Wit

doi:10.1093/mnrasl/slab037

A transit timing variation observed for the long-period extremely low density exoplanet HIP 41378f

Edward M. Bryant, Daniel Bayliss, Alexandre Santerne, Peter J. Wheatley, Valerio Nascimbeni, Elsa Ducrot, Artem Burdanov, Jack S. Acton, Douglas R. Alves, David R. Anderson, David J. Armstrong, Supachai Awiphan, Benjamin F. Cooke, Matthew R. Burleigh, Sarah L. Casewell, Laetitia Delrez, Brice-Olivier Demory, Philipp Eigmüller, Akihiko Fukui, Tianjun GanSamuel Gill, Michael Gillon, Michael R. Goad, Thiam-Guan Tan, Maximilian N. Günther, Bronwen Hardee, Beth A. Henderson, Emmanuel Jehin, James S. Jenkins, Molly Kosiarek, Monika Lendl, Maximiliano Moyano, Catriona A. Murray, Norio Narita, Prajwal Niraula, Caroline E. Odden, Enric Palle, Hannu Parviainen, Peter P. Pedersen, Francisco J. Pozuelos, Benjamin V. Rackham, Daniel Sebastian, Chris Stockdale, Rosanna H. Tilbrook, Samantha J. Thompson, Amaury H. M. J. Triaud, Stéphane Udry, Jose I. Vines, Richard G. West, Julien de Wit

Physics and Astronomy

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Abstract

HIP 41378 f is a temperate 9.2 ± 0.1 R_⊕ planet with period of 542.08 d and an extremely low density of 0.09 ± 0.02 g cm⁻³. It transits the bright star HIP 41378 (V=8.93),making it an exciting target for atmospheric characterization including transmission spectroscopy. HIP 41378 was monitored photometrically between the dates of 2019 November 19 and 28. We detected a transit of HIP 41378 f with NGTS, just the third transit ever detected for this planet, which confirms the orbital period. This is also the first ground-based detection of a transit of HIP 41378 f. Additional ground-based photometry was also obtained and used to constrain the time of the transit. The transit was measured to occur 1.50 h earlier than predicted. We use an analytic transit timing variation (TTV) model to show the observed TTV can be explained by interactions between HIP 41378 e and HIP 41378 f. Using our TTV model, we predict the epochs of future transits of HIP 41378 f, with derived transit centres of T_{C, 4}=2459 355.087^+0.031_−0.022
(2021 May) and T_{C, 5} =2459 897.078^+0.114_−0.060(2022 November).

Original language	English
Pages (from-to)	L45–L50
Journal	Monthly Notices of the Royal Astronomical Society: Letters
Volume	504
Issue number	1
Early online date	16 Apr 2021
DOIs	https://doi.org/10.1093/mnrasl/slab037
Publication status	Published - Jun 2021

Keywords

astro-ph.EP

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BryantEM2021transit
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters, © 2021 The Author(s), Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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Bryant, E. M., Bayliss, D., Santerne, A., Wheatley, P. J., Nascimbeni, V., Ducrot, E., Burdanov, A., Acton, J. S., Alves, D. R., Anderson, D. R., Armstrong, D. J., Awiphan, S., Cooke, B. F., Burleigh, M. R., Casewell, S. L., Delrez, L., Demory, B.-O., Eigmüller, P., Fukui, A., ... Wit, J. D. (2021). A transit timing variation observed for the long-period extremely low density exoplanet HIP 41378f. Monthly Notices of the Royal Astronomical Society: Letters, 504(1), L45–L50. https://doi.org/10.1093/mnrasl/slab037

@article{be734b63aef541bf95e3ba8f45b2a45f,

title = "A transit timing variation observed for the long-period extremely low density exoplanet HIP 41378f",

abstract = "HIP 41378 f is a temperate 9.2 ± 0.1 R⊕ planet with period of 542.08 d and an extremely low density of 0.09 ± 0.02 g cm−3. It transits the bright star HIP 41378 (V=8.93),making it an exciting target for atmospheric characterization including transmission spectroscopy. HIP 41378 was monitored photometrically between the dates of 2019 November 19 and 28. We detected a transit of HIP 41378 f with NGTS, just the third transit ever detected for this planet, which confirms the orbital period. This is also the first ground-based detection of a transit of HIP 41378 f. Additional ground-based photometry was also obtained and used to constrain the time of the transit. The transit was measured to occur 1.50 h earlier than predicted. We use an analytic transit timing variation (TTV) model to show the observed TTV can be explained by interactions between HIP 41378 e and HIP 41378 f. Using our TTV model, we predict the epochs of future transits of HIP 41378 f, with derived transit centres of TC, 4 =2459 355.087+0.031−0.022(2021 May) and TC, 5 =2459 897.078+0.114 −0.060 (2022 November).",

keywords = "astro-ph.EP",

author = "Bryant, {Edward M.} and Daniel Bayliss and Alexandre Santerne and Wheatley, {Peter J.} and Valerio Nascimbeni and Elsa Ducrot and Artem Burdanov and Acton, {Jack S.} and Alves, {Douglas R.} and Anderson, {David R.} and Armstrong, {David J.} and Supachai Awiphan and Cooke, {Benjamin F.} and Burleigh, {Matthew R.} and Casewell, {Sarah L.} and Laetitia Delrez and Brice-Olivier Demory and Philipp Eigm{\"u}ller and Akihiko Fukui and Tianjun Gan and Samuel Gill and Michael Gillon and Goad, {Michael R.} and Thiam-Guan Tan and G{\"u}nther, {Maximilian N.} and Bronwen Hardee and Henderson, {Beth A.} and Emmanuel Jehin and Jenkins, {James S.} and Molly Kosiarek and Monika Lendl and Maximiliano Moyano and Murray, {Catriona A.} and Norio Narita and Prajwal Niraula and Odden, {Caroline E.} and Enric Palle and Hannu Parviainen and Pedersen, {Peter P.} and Pozuelos, {Francisco J.} and Rackham, {Benjamin V.} and Daniel Sebastian and Chris Stockdale and Tilbrook, {Rosanna H.} and Thompson, {Samantha J.} and Triaud, {Amaury H. M. J.} and St{\'e}phane Udry and Vines, {Jose I.} and West, {Richard G.} and Wit, {Julien de}",

year = "2021",

month = jun,

doi = "10.1093/mnrasl/slab037",

language = "English",

volume = "504",

pages = "L45–L50",

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

issn = "1745-3933",

publisher = "Oxford University Press",

number = "1",

}

Bryant, EM, Bayliss, D, Santerne, A, Wheatley, PJ, Nascimbeni, V, Ducrot, E, Burdanov, A, Acton, JS, Alves, DR, Anderson, DR, Armstrong, DJ, Awiphan, S, Cooke, BF, Burleigh, MR, Casewell, SL, Delrez, L, Demory, B-O, Eigmüller, P, Fukui, A, Gan, T, Gill, S, Gillon, M, Goad, MR, Tan, T-G, Günther, MN, Hardee, B, Henderson, BA, Jehin, E, Jenkins, JS, Kosiarek, M, Lendl, M, Moyano, M, Murray, CA, Narita, N, Niraula, P, Odden, CE, Palle, E, Parviainen, H, Pedersen, PP, Pozuelos, FJ, Rackham, BV, Sebastian, D, Stockdale, C, Tilbrook, RH, Thompson, SJ, Triaud, AHMJ, Udry, S, Vines, JI, West, RG & Wit, JD 2021, 'A transit timing variation observed for the long-period extremely low density exoplanet HIP 41378f', Monthly Notices of the Royal Astronomical Society: Letters, vol. 504, no. 1, pp. L45–L50. https://doi.org/10.1093/mnrasl/slab037

TY - JOUR

T1 - A transit timing variation observed for the long-period extremely low density exoplanet HIP 41378f

AU - Bryant, Edward M.

AU - Bayliss, Daniel

AU - Santerne, Alexandre

AU - Wheatley, Peter J.

AU - Nascimbeni, Valerio

AU - Ducrot, Elsa

AU - Burdanov, Artem

AU - Acton, Jack S.

AU - Alves, Douglas R.

AU - Anderson, David R.

AU - Armstrong, David J.

AU - Awiphan, Supachai

AU - Cooke, Benjamin F.

AU - Burleigh, Matthew R.

AU - Casewell, Sarah L.

AU - Delrez, Laetitia

AU - Demory, Brice-Olivier

AU - Eigmüller, Philipp

AU - Fukui, Akihiko

AU - Gan, Tianjun

AU - Gill, Samuel

AU - Gillon, Michael

AU - Goad, Michael R.

AU - Tan, Thiam-Guan

AU - Günther, Maximilian N.

AU - Hardee, Bronwen

AU - Henderson, Beth A.

AU - Jehin, Emmanuel

AU - Jenkins, James S.

AU - Kosiarek, Molly

AU - Lendl, Monika

AU - Moyano, Maximiliano

AU - Murray, Catriona A.

AU - Narita, Norio

AU - Niraula, Prajwal

AU - Odden, Caroline E.

AU - Palle, Enric

AU - Parviainen, Hannu

AU - Pedersen, Peter P.

AU - Pozuelos, Francisco J.

AU - Rackham, Benjamin V.

AU - Sebastian, Daniel

AU - Stockdale, Chris

AU - Tilbrook, Rosanna H.

AU - Thompson, Samantha J.

AU - Triaud, Amaury H. M. J.

AU - Udry, Stéphane

AU - Vines, Jose I.

AU - West, Richard G.

AU - Wit, Julien de

PY - 2021/6

Y1 - 2021/6

N2 - HIP 41378 f is a temperate 9.2 ± 0.1 R⊕ planet with period of 542.08 d and an extremely low density of 0.09 ± 0.02 g cm−3. It transits the bright star HIP 41378 (V=8.93),making it an exciting target for atmospheric characterization including transmission spectroscopy. HIP 41378 was monitored photometrically between the dates of 2019 November 19 and 28. We detected a transit of HIP 41378 f with NGTS, just the third transit ever detected for this planet, which confirms the orbital period. This is also the first ground-based detection of a transit of HIP 41378 f. Additional ground-based photometry was also obtained and used to constrain the time of the transit. The transit was measured to occur 1.50 h earlier than predicted. We use an analytic transit timing variation (TTV) model to show the observed TTV can be explained by interactions between HIP 41378 e and HIP 41378 f. Using our TTV model, we predict the epochs of future transits of HIP 41378 f, with derived transit centres of TC, 4 =2459 355.087+0.031−0.022(2021 May) and TC, 5 =2459 897.078+0.114 −0.060 (2022 November).

AB - HIP 41378 f is a temperate 9.2 ± 0.1 R⊕ planet with period of 542.08 d and an extremely low density of 0.09 ± 0.02 g cm−3. It transits the bright star HIP 41378 (V=8.93),making it an exciting target for atmospheric characterization including transmission spectroscopy. HIP 41378 was monitored photometrically between the dates of 2019 November 19 and 28. We detected a transit of HIP 41378 f with NGTS, just the third transit ever detected for this planet, which confirms the orbital period. This is also the first ground-based detection of a transit of HIP 41378 f. Additional ground-based photometry was also obtained and used to constrain the time of the transit. The transit was measured to occur 1.50 h earlier than predicted. We use an analytic transit timing variation (TTV) model to show the observed TTV can be explained by interactions between HIP 41378 e and HIP 41378 f. Using our TTV model, we predict the epochs of future transits of HIP 41378 f, with derived transit centres of TC, 4 =2459 355.087+0.031−0.022(2021 May) and TC, 5 =2459 897.078+0.114 −0.060 (2022 November).

KW - astro-ph.EP

U2 - 10.1093/mnrasl/slab037

DO - 10.1093/mnrasl/slab037

M3 - Article

SN - 1745-3933

VL - 504

SP - L45–L50

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

IS - 1

ER -

A transit timing variation observed for the long-period extremely low density exoplanet HIP 41378f

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