A Discrete Set of Possible Transit Ephemerides for Two Long-period Gas Giants Orbiting HIP 41378

Juliette C. Becker, Andrew Vanderburg, Joseph E. Rodriguez, Mark Omohundro, Fred C. Adams, Keivan G. Stassun, Xinyu Yao, Joel Hartman, Joshua Pepper, Gaspar Bakos, Geert Barentsen, Thomas Beatty, Waqas Bhatti, Ashley Chontos, Andrew Collier Cameron, Coel Hellier, Daniel Huber, David James, Rudolf B. Kuhn, Michael B. LundDon Pollacco, Robert J. Siverd, Daniel J. Stevens, José Vinícius De Miranda Cardoso, Richard West

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In 2015, K2 observations of the bright (V = 8.9, K = 7.7) star HIP 41378 revealed a rich system of at least five transiting exoplanets, ranging in size from super-Earths to gas giants. The 2015 K2 observations only spanned 74.8 days, and the outer three long-period planets in the system were only detected with a single transit, so their orbital periods and transit ephemerides could not be determined at that time. Here, we report on 50.8 days of new K2 observations of HIP 41378 from summer 2018. These data reveal additional transits of the long-period planets HIP 41378 d and HIP 41378 f, yielding a set of discrete possible orbital periods for these two planets. We identify the most probable orbital periods for these two planets using our knowledge of the planets' transit durations, the host star's properties, the system's dynamics, and data from the ground-based HATNet, KELT, and WASP transit surveys. Targeted photometric follow-up during the most probable future transit times will be able to determine the planets' orbital periods and will enable future observations with facilities like the James Webb Space Telescope. The methods developed herein to determine the most probable orbital periods will be important for long-period planets detected by the Transiting Exoplanet Survey Satellite, where similar period ambiguities will frequently arise due to the mission's survey strategy.

Original languageEnglish (US)
Article number19
JournalAstronomical Journal
Volume157
Issue number1
DOIs
StatePublished - Jan 1 2019

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ephemerides
hot isostatic pressing
transit
planets
planet
gases
gas
orbitals
extrasolar planets
stars
James Webb Space Telescope
transit time
ambiguity
summer

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Becker, J. C., Vanderburg, A., Rodriguez, J. E., Omohundro, M., Adams, F. C., Stassun, K. G., ... West, R. (2019). A Discrete Set of Possible Transit Ephemerides for Two Long-period Gas Giants Orbiting HIP 41378. Astronomical Journal, 157(1), [19]. https://doi.org/10.3847/1538-3881/aaf0a2
Becker, Juliette C. ; Vanderburg, Andrew ; Rodriguez, Joseph E. ; Omohundro, Mark ; Adams, Fred C. ; Stassun, Keivan G. ; Yao, Xinyu ; Hartman, Joel ; Pepper, Joshua ; Bakos, Gaspar ; Barentsen, Geert ; Beatty, Thomas ; Bhatti, Waqas ; Chontos, Ashley ; Cameron, Andrew Collier ; Hellier, Coel ; Huber, Daniel ; James, David ; Kuhn, Rudolf B. ; Lund, Michael B. ; Pollacco, Don ; Siverd, Robert J. ; Stevens, Daniel J. ; Cardoso, José Vinícius De Miranda ; West, Richard. / A Discrete Set of Possible Transit Ephemerides for Two Long-period Gas Giants Orbiting HIP 41378. In: Astronomical Journal. 2019 ; Vol. 157, No. 1.
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abstract = "In 2015, K2 observations of the bright (V = 8.9, K = 7.7) star HIP 41378 revealed a rich system of at least five transiting exoplanets, ranging in size from super-Earths to gas giants. The 2015 K2 observations only spanned 74.8 days, and the outer three long-period planets in the system were only detected with a single transit, so their orbital periods and transit ephemerides could not be determined at that time. Here, we report on 50.8 days of new K2 observations of HIP 41378 from summer 2018. These data reveal additional transits of the long-period planets HIP 41378 d and HIP 41378 f, yielding a set of discrete possible orbital periods for these two planets. We identify the most probable orbital periods for these two planets using our knowledge of the planets' transit durations, the host star's properties, the system's dynamics, and data from the ground-based HATNet, KELT, and WASP transit surveys. Targeted photometric follow-up during the most probable future transit times will be able to determine the planets' orbital periods and will enable future observations with facilities like the James Webb Space Telescope. The methods developed herein to determine the most probable orbital periods will be important for long-period planets detected by the Transiting Exoplanet Survey Satellite, where similar period ambiguities will frequently arise due to the mission's survey strategy.",
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Becker, JC, Vanderburg, A, Rodriguez, JE, Omohundro, M, Adams, FC, Stassun, KG, Yao, X, Hartman, J, Pepper, J, Bakos, G, Barentsen, G, Beatty, T, Bhatti, W, Chontos, A, Cameron, AC, Hellier, C, Huber, D, James, D, Kuhn, RB, Lund, MB, Pollacco, D, Siverd, RJ, Stevens, DJ, Cardoso, JVDM & West, R 2019, 'A Discrete Set of Possible Transit Ephemerides for Two Long-period Gas Giants Orbiting HIP 41378', Astronomical Journal, vol. 157, no. 1, 19. https://doi.org/10.3847/1538-3881/aaf0a2

A Discrete Set of Possible Transit Ephemerides for Two Long-period Gas Giants Orbiting HIP 41378. / Becker, Juliette C.; Vanderburg, Andrew; Rodriguez, Joseph E.; Omohundro, Mark; Adams, Fred C.; Stassun, Keivan G.; Yao, Xinyu; Hartman, Joel; Pepper, Joshua; Bakos, Gaspar; Barentsen, Geert; Beatty, Thomas; Bhatti, Waqas; Chontos, Ashley; Cameron, Andrew Collier; Hellier, Coel; Huber, Daniel; James, David; Kuhn, Rudolf B.; Lund, Michael B.; Pollacco, Don; Siverd, Robert J.; Stevens, Daniel J.; Cardoso, José Vinícius De Miranda; West, Richard.

In: Astronomical Journal, Vol. 157, No. 1, 19, 01.01.2019.

Research output: Contribution to journalArticle

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T1 - A Discrete Set of Possible Transit Ephemerides for Two Long-period Gas Giants Orbiting HIP 41378

AU - Becker, Juliette C.

AU - Vanderburg, Andrew

AU - Rodriguez, Joseph E.

AU - Omohundro, Mark

AU - Adams, Fred C.

AU - Stassun, Keivan G.

AU - Yao, Xinyu

AU - Hartman, Joel

AU - Pepper, Joshua

AU - Bakos, Gaspar

AU - Barentsen, Geert

AU - Beatty, Thomas

AU - Bhatti, Waqas

AU - Chontos, Ashley

AU - Cameron, Andrew Collier

AU - Hellier, Coel

AU - Huber, Daniel

AU - James, David

AU - Kuhn, Rudolf B.

AU - Lund, Michael B.

AU - Pollacco, Don

AU - Siverd, Robert J.

AU - Stevens, Daniel J.

AU - Cardoso, José Vinícius De Miranda

AU - West, Richard

PY - 2019/1/1

Y1 - 2019/1/1

N2 - In 2015, K2 observations of the bright (V = 8.9, K = 7.7) star HIP 41378 revealed a rich system of at least five transiting exoplanets, ranging in size from super-Earths to gas giants. The 2015 K2 observations only spanned 74.8 days, and the outer three long-period planets in the system were only detected with a single transit, so their orbital periods and transit ephemerides could not be determined at that time. Here, we report on 50.8 days of new K2 observations of HIP 41378 from summer 2018. These data reveal additional transits of the long-period planets HIP 41378 d and HIP 41378 f, yielding a set of discrete possible orbital periods for these two planets. We identify the most probable orbital periods for these two planets using our knowledge of the planets' transit durations, the host star's properties, the system's dynamics, and data from the ground-based HATNet, KELT, and WASP transit surveys. Targeted photometric follow-up during the most probable future transit times will be able to determine the planets' orbital periods and will enable future observations with facilities like the James Webb Space Telescope. The methods developed herein to determine the most probable orbital periods will be important for long-period planets detected by the Transiting Exoplanet Survey Satellite, where similar period ambiguities will frequently arise due to the mission's survey strategy.

AB - In 2015, K2 observations of the bright (V = 8.9, K = 7.7) star HIP 41378 revealed a rich system of at least five transiting exoplanets, ranging in size from super-Earths to gas giants. The 2015 K2 observations only spanned 74.8 days, and the outer three long-period planets in the system were only detected with a single transit, so their orbital periods and transit ephemerides could not be determined at that time. Here, we report on 50.8 days of new K2 observations of HIP 41378 from summer 2018. These data reveal additional transits of the long-period planets HIP 41378 d and HIP 41378 f, yielding a set of discrete possible orbital periods for these two planets. We identify the most probable orbital periods for these two planets using our knowledge of the planets' transit durations, the host star's properties, the system's dynamics, and data from the ground-based HATNet, KELT, and WASP transit surveys. Targeted photometric follow-up during the most probable future transit times will be able to determine the planets' orbital periods and will enable future observations with facilities like the James Webb Space Telescope. The methods developed herein to determine the most probable orbital periods will be important for long-period planets detected by the Transiting Exoplanet Survey Satellite, where similar period ambiguities will frequently arise due to the mission's survey strategy.

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Becker JC, Vanderburg A, Rodriguez JE, Omohundro M, Adams FC, Stassun KG et al. A Discrete Set of Possible Transit Ephemerides for Two Long-period Gas Giants Orbiting HIP 41378. Astronomical Journal. 2019 Jan 1;157(1). 19. https://doi.org/10.3847/1538-3881/aaf0a2