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Characterizing a World Within the Hot-Neptune Desert: Transit Observations of LTT 9779 b with the Hubble Space Telescope/WFC3

  • Authors: Billy Edwards, Quentin Changeat, Angelos Tsiaras, Andrew Allan, Patrick Behr, Simone R. Hagey, Michael D. Himes, Sushuang Ma, Keivan G. Stassun, Luis Thomas, Alexandra Thompson, Aaron Boley, Luke Booth, Jeroen Bouwman, Kevin France, Nataliea Lowson, Annabella Meech, Caprice L. Phillips, Aline A. Vidotto, Kai Hou Yip, Michelle Bieger, Amélie Gressier, Estelle Janin, Ing-Guey Jiang, Pietro Leonardi, Subhajit Sarkar, Nour Skaf, Jake Taylor, Ming Yang, Derek Ward-Thompson

Billy Edwards et al 2023 The Astronomical Journal 166 .

  • Provider: AAS Journals

Caption: Figure 17.

One source of orbital precession could be other planets within the system. We show the possible parameter space for the mass and orbital separation of a companion planet (LTT 9779 c) for three possible precession rates: the best-fit value from our model fit (black) and those of the two candidate solutions identified in Pearson (2019; blue and orange). The blue and orange dashed lines are the same as the latter but corrected for the expected precession from other effects calculated in Equation (14). The solid part of the black line represents the possible mass-separation solutions for a companion planet that would provide the best-fit apsidal precession rate from the timing data while remaining undetected in the radial velocity data (K < 5 m s−1) given the residuals of our fit (see Figure 11).

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