GEO and LEO: The Final Frontier for Plutonic FFP Parallax
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arXiv
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| Formato: | Preprint |
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2024
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| _version_ | 1866914894368997376 |
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| author | Gould, Andrew |
| author_facet | Gould, Andrew |
| contents | I show that microlens parallaxes, $π_{\rm E}$, can be derived for free-floating planets (FFPs) with masses down to that of Pluto, by combining observations from a satellite in geosynchronous (GEO) orbit with another observatory that is on or near Earth's surface, i.e., either ground-based or in low Earth orbit (LEO). Because these low-mass FFPs typically have measurements of the angular Einstein radius, $θ_{\rm E}$, from finite-source effects, such $π_{\rm E}$ measurements directly yield the FFP mass $M=θ_{\rm E}/κπ_{\rm E}$ where $κ$ is a physical constant. Such Earth-GEO measurements almost perfectly complement Earth-L2 measurements, which extend to higher FFP mass and greater FFP distance. LEO-only observations can yield mass measurement at even smaller FFP mass and nearer FFP distances. I discuss methods for breaking the Refsdal (1966) two-fold degeneracy in $π_{{\rm E},\pm}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_21696 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | GEO and LEO: The Final Frontier for Plutonic FFP Parallax Gould, Andrew Earth and Planetary Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics I show that microlens parallaxes, $π_{\rm E}$, can be derived for free-floating planets (FFPs) with masses down to that of Pluto, by combining observations from a satellite in geosynchronous (GEO) orbit with another observatory that is on or near Earth's surface, i.e., either ground-based or in low Earth orbit (LEO). Because these low-mass FFPs typically have measurements of the angular Einstein radius, $θ_{\rm E}$, from finite-source effects, such $π_{\rm E}$ measurements directly yield the FFP mass $M=θ_{\rm E}/κπ_{\rm E}$ where $κ$ is a physical constant. Such Earth-GEO measurements almost perfectly complement Earth-L2 measurements, which extend to higher FFP mass and greater FFP distance. LEO-only observations can yield mass measurement at even smaller FFP mass and nearer FFP distances. I discuss methods for breaking the Refsdal (1966) two-fold degeneracy in $π_{{\rm E},\pm}$. |
| title | GEO and LEO: The Final Frontier for Plutonic FFP Parallax |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2407.21696 |