Hunting for Cold Exoplanets via Microlensing
Microlensing can detect planets at distances ranging from a few hundred parsecs all the way to the Galactic center. The maximum sensitivity is reached for systems that are located half way to the galactic center, with planets orbiting the lens star at a separation of few AUs. It is the only method c...
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Académie des sciences
2023-08-01
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| Series: | Comptes Rendus. Physique |
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| Online Access: | https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.151/ |
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| author | Beaulieu, Jean-Philippe |
| author_facet | Beaulieu, Jean-Philippe |
| author_sort | Beaulieu, Jean-Philippe |
| collection | DOAJ |
| description | Microlensing can detect planets at distances ranging from a few hundred parsecs all the way to the Galactic center. The maximum sensitivity is reached for systems that are located half way to the galactic center, with planets orbiting the lens star at a separation of few AUs. It is the only method currently probing exoplanets in the Earth-Saturn mass range beyond the snow line, where the core accretion theory originally predicted that most massive planets would form. Although the number of detected planets is relatively modest ($\sim $130 planets to date) compared to that discovered by radial velocity and transit methods, microlensing probes a part of the parameter space (host separation as a function of planet mass), which is mostly not accessible in the medium term to any other technique. Microlensing has discovered the first cold super-Earth, and the first Jupiter planet orbiting a white dwarf. It also detected a number of Earth, Super-Earth, Neptune, Saturn, Jupiter, super-Jupiter orbiting main sequence stars in the mass range 0.08 – 1M$\odot $. It also observed circumbinary planets, Jupiter in the habitable zone, the first exomoon candidate and free-floating planets. It has shown that having a planet is the rule for stars in our galaxy and shown that super-Earth and Neptune are more abundant than smaller mass telluric planets. Ground based microlensing will provide soon the mass function of cold planets down to few Earth Masses. The next phase, is a 450 days survey with the NASA Nancy Grace Roman Space Telescope from 2027. It will detect 3000+ planets and provide the mass function of cold planets down to the mass of Mars. If combined with the European Euclid Space mission, we will be able to probe for free-floating telluric planets and measure their masses. |
| format | Article |
| id | doaj-art-77e763ee0acf4bc19f0765efd67cf032 |
| institution | Kabale University |
| issn | 1878-1535 |
| language | English |
| publishDate | 2023-08-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Physique |
| spelling | doaj-art-77e763ee0acf4bc19f0765efd67cf0322025-02-07T13:52:55ZengAcadémie des sciencesComptes Rendus. Physique1878-15352023-08-0124S2576810.5802/crphys.15110.5802/crphys.151Hunting for Cold Exoplanets via MicrolensingBeaulieu, Jean-Philippe0Institut d’Astrophysique de Paris, Sorbonne Universite, CNRS UMR 7095, 98bis Boulevard Arago, 75015 Paris, France; School of Physical Sciences, University of Tasmania, Private Bag 37 Hobart, Tasmania 7001 AustraliaMicrolensing can detect planets at distances ranging from a few hundred parsecs all the way to the Galactic center. The maximum sensitivity is reached for systems that are located half way to the galactic center, with planets orbiting the lens star at a separation of few AUs. It is the only method currently probing exoplanets in the Earth-Saturn mass range beyond the snow line, where the core accretion theory originally predicted that most massive planets would form. Although the number of detected planets is relatively modest ($\sim $130 planets to date) compared to that discovered by radial velocity and transit methods, microlensing probes a part of the parameter space (host separation as a function of planet mass), which is mostly not accessible in the medium term to any other technique. Microlensing has discovered the first cold super-Earth, and the first Jupiter planet orbiting a white dwarf. It also detected a number of Earth, Super-Earth, Neptune, Saturn, Jupiter, super-Jupiter orbiting main sequence stars in the mass range 0.08 – 1M$\odot $. It also observed circumbinary planets, Jupiter in the habitable zone, the first exomoon candidate and free-floating planets. It has shown that having a planet is the rule for stars in our galaxy and shown that super-Earth and Neptune are more abundant than smaller mass telluric planets. Ground based microlensing will provide soon the mass function of cold planets down to few Earth Masses. The next phase, is a 450 days survey with the NASA Nancy Grace Roman Space Telescope from 2027. It will detect 3000+ planets and provide the mass function of cold planets down to the mass of Mars. If combined with the European Euclid Space mission, we will be able to probe for free-floating telluric planets and measure their masses.https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.151/ExoplanetsGravitational LensingObservationsDetection of ExoplanetsPlanetary SystemsMicro-lensing |
| spellingShingle | Beaulieu, Jean-Philippe Hunting for Cold Exoplanets via Microlensing Comptes Rendus. Physique Exoplanets Gravitational Lensing Observations Detection of Exoplanets Planetary Systems Micro-lensing |
| title | Hunting for Cold Exoplanets via Microlensing |
| title_full | Hunting for Cold Exoplanets via Microlensing |
| title_fullStr | Hunting for Cold Exoplanets via Microlensing |
| title_full_unstemmed | Hunting for Cold Exoplanets via Microlensing |
| title_short | Hunting for Cold Exoplanets via Microlensing |
| title_sort | hunting for cold exoplanets via microlensing |
| topic | Exoplanets Gravitational Lensing Observations Detection of Exoplanets Planetary Systems Micro-lensing |
| url | https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.151/ |
| work_keys_str_mv | AT beaulieujeanphilippe huntingforcoldexoplanetsviamicrolensing |