2-planet Systems Masquerading as Eccentric Planets - Application to HD 7449, HD 65216, HD 89744, HD 92788

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Post by Sirius_Alpha on 24th January 2019, 10:01 pm

Truly eccentric. I. Revisiting eight single-eccentric planetary systems
https://arxiv.org/abs/1901.08471

We examine eight known single-eccentric planetary systems in light of recently released large data archives and new analysis techniques. For four of these systems (HD 7449, HD 65216, HD 89744, HD 92788) we find evidence for additional long-period companions. HD 65216c is a Jupiter analog, with a period of 14.7 yr, e=0.18, and m sin i of 2M_Jup, whilst the remaining candidate companions move on as-yet-incomplete orbits. Our results highlight the importance of revisiting the analysis of known exoplanetary systems when new data become available, particularly given the possibility that poorly-sampled data might previously have led to the detection of a 'false-positive' single eccentric planet, when the system in question actually contains two (or more) planets on near-circular orbits.

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Post by Sirius_Alpha on 24th January 2019, 10:50 pm

They report a second long-period, massive companion to HD 7449, which is probably the same directly imaged M dwarf companion reported by Rodigas et al (2015). https://arxiv.org/abs/1512.04540v2

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Post by Lazarus on 30th January 2019, 7:12 pm

That does seem like a likely possibility. Looks like they missed that reference.
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Post by Sirius_Alpha on 30th January 2019, 8:17 pm

Yeah I e-mailed the lead author and that was indeed the case (referee also missed it). The paper will be updated in the final version.

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