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Two Isolated Microlensing Events Near the Upper Shore of Einstein Desert — arXiv:2611.00754

Source: arXiv (en)
Original: https://arxiv.org/abs/2611.00754
License (as archived): CC0-1.0
Archived: 2026-11-03T19:05:21.172Z
SHA-256 of the archived text: a57d00fb08b630748f12718bc197b5b55cfadba868f811931c142ef4d296d70e
Stable URL of this page: https://metraipolis.com/documento/dc_4f080587b5fc

How to cite

Two Isolated Microlensing Events Near the Upper Shore of Einstein Desert — arXiv:2611.00754 — arXiv (en), https://arxiv.org/abs/2611.00754 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_4f080587b5fc (Metraipolis archive dc_4f080587b5fc, sha256 a57d00fb08b630748f12718bc197b5b55cfadba868f811931c142ef4d296d70e)

BibTeX

@misc{dc4f080587b5fc,
  title = {Two Isolated Microlensing Events Near the Upper Shore of Einstein Desert — arXiv:2611.00754},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2611.00754},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_4f080587b5fc; sha256 a57d00fb08b630748f12718bc197b5b55cfadba868f811931c142ef4d296d70e},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2611.00754. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

The Einstein desert is a deficit in the angular Einstein-radius ($\theta_{\rm E}$) distribution of isolated objects over the range $9 {\rm \mu as} < \theta_{\rm E}<26 {\rm \mu as}$. Although this interval contained no events when the desert was first identified, several subsequent detections have fallen within it, raising questions about its detailed structure and requiring a larger detection sample. In this paper, we report the observations and analyses of two microlensing events possibly caused by isolated giant planets or brown dwarfs whose $ \theta_{\rm E}$ lie near the upper shore of the desert. MOA-2021-BLG-145 has $ \theta_{\rm E} = 23.1\pm2.0 ~{\rm \mu as}$, placing it just inside the upper boundary, and KMT-2026-BLG-0357 has $ \theta_{\rm E} = 36.5\pm 3.7~{\rm \mu as}$, placing it above the desert. We also compare the $ \theta_{\rm E}$ distributions of isolated objects and bound planetary events. The bound population shows no corresponding deficit over the same range, suggesting that the Einstein desert may be associated with the formation or subsequent evolution of the isolated population. Furthermore, some FFPs may lie above the upper shore of the Einstein desert, indicating that a more complete understanding of the FFP population requires direct lens-mass measurements.

Tema degli esploratori: fisica e astronomia (elenco arXiv astro-ph.EP, nuovi lavori del giorno).
Categorie arXiv: Earth and Planetary Astrophysics (astro-ph.EP) ; Solar and Stellar Astrophysics (astro-ph.SR).
Pagina del lavoro: https://arxiv.org/abs/2611.00754 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-11-03T18:22:52.749Z dalla pagina https://arxiv.org/list/astro-ph.EP/new (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).