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A Ground-based Transit Observation of the Long-period Extremely Low-density Planet HIP 41378 f

  • Authors: Juliana García-Mejía, Zoë L. de Beurs, Patrick Tamburo, Andrew Vanderburg, David Charbonneau, Karen A. Collins, Khalid Barkaoui, Cristilyn N. Watkins, Chris Stockdale, Richard P. Schwarz, Raquel Forés-Toribio, Jose A. Muñoz, Giovanni Isopi, Franco Mallia, Aldo Zapparata, Adam Popowicz, Andrzej Brudny, Eric Agol, Munazza K. Alam, Zouhair Benkhaldoun, Jehin Emmanuel, Mourad Ghachoui, Michaël Gillon, Keith Horne, Enric Palle, Ramotholo Sefako, Avi Shporer, Mathilde Timmermans

Juliana García-Mejía et al 2026 The Astronomical Journal 171 .

  • Provider: AAS Journals

Caption: Figure 6.

Building on the work from S. Sulis et al. (2024), we plot all TESS sectors that have targeted HIP 41378 (7, 34, 44, 45, 46, 61, 72, and 88) binned to 3 hr and phase-folded to the four possible orbital periods for HIP 41378 d (P = 101.2224 days in green, P = 278.3616 days in purple, P = 371.1488 days in yellow, and P = 1113.4465 days in blue). Unbinned data are shown as small semi-transparent points, with TESS Sector 88 data (higher opacity) highlighting the new observations that enable us to rule out the 101 days solution. Binned data are shown as larger black points. The red dashed lines indicate the expected transit depth of HIP 41378 d (0.67 ppt, J. C. Becker et al. 2019). The 101 days solution is inconsistent with the TESS data at 7.2σ confidence. Gray points show 38 s CHEOPS data from S. Sulis et al. (2024).

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