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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 2.

The light curve for the transit of HIP 41378 f. The plot shows unbinned photometry (small, semi-transparent points) and 10 minutes binned photometry (large symbols) from multi-night datasets. The data are color-coded by telescope: Tierras (pink circles), TRAPPIST-North (violet flags), and LCOGT McD 0.35 m (teal diamonds). The predicted transit model from A22 (TC,6 = 2460438.95 ± 0.02 BJD) is shown as a solid black line. Our median model is shown as a dashed red line (TC,6 = 2460438.891 ± 0.052). Gray lines represent 500 random model iterations drawn from the posterior density distribution shown in Figure 5. All model iterations assume P = 542.07975 days, RP/R = 0.0663, a/R = 231.417, i = 89﹩\mathop{.}\limits^{\unicode{x000b0}}﹩971, and u = 0.0 (A. Santerne et al. 2019). UTC dates corresponding to the observations are displayed at the top of the figure. The LCOGT McD 1.0 m datasets are not shown; see Section 4.2 and Figure 4 for exclusion criteria.

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