PA-99-N2

PA-99-N2
Event type	Exoplanet
Constellation	Andromeda
Right ascension	00h 44m 20.89s[1]
Declination	+41° 28′ 44.6″[1]
Epoch	J2000
Distance	2,185,247.73 ly (670,000 pc)[2]

PA-99-N2 is a microlensing event detected in the direction of the Andromeda Galaxy in 1999.

Explanations

One possibility for the event is that a star in the disk of M31 gravitationally lensed a red giant also in the disk. The lensing star would have a mass between 0.02 M_☉ and 3.6 M_☉ with the most likely value near 0.5 M_☉. In this case the lens profile makes it likely that the star has a planet.[2][3]

Possible exoplanet

The possible exoplanet would have a mass of 6.34 Jupiter mass. If confirmed, it would be the first exoplanet found in another galaxy.[4]

The PA-99-N2 planetary system[2]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b (unconfirmed)	6.34 M_J	—	—	—	—	—

gollark: Yemmel = Bignum ≈ Lignum

gollark: Lignum can be LOGICALLY SHOWN to be Yemmel.

gollark: When I tried to run a new krist node, it broke horribly and I eventually got it to not error (still didn't work) but there's a bug with the block values on new nodes.

gollark: As in, ones without a preexisting database.

gollark: Well, new ones, at least.

References

"MEGA-ML 7". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 June 2018.
"The Extrasolar Planet Encyclopaedia — PA-99-N2 b". exoplanet.eu. Retrieved 2017-07-30.
Ingrosso, G.; Paolis, F. DE; Novati, S. Calchi; Jetzer, PH.; Nucita, A. A.; Zakharov, A. F. (2012). "Detection of Exoplanets in M31 with Pixel-Lensing: The Event Pa-99-N2 Case". The Twelfth Marcel Grossmann Meeting. The Twelfth Marcel Grossmann Meeting: on Recent Developments in Theoretical and Experimental General Relativity. p. 2191. arXiv:1001.2105. Bibcode:2012mgm..conf.2191I. doi:10.1142/9789814374552_0433. ISBN 978-981-4374-51-4.
An, Jin H.; Evans, N. W.; Kerins, E.; Baillon, P.; Calchi Novati, S.; Carr, B. J.; Creze, M.; Giraud‐Heraud, Y.; Gould, A.; Hewett, P.; Jetzer, Ph.; Kaplan, J.; Paulin‐Henriksson, S.; Smartt, S. J.; Tsapras, Y.; Valls‐Gabaud, D. (February 2004). "The Anomaly in the Candidate Microlensing Event PA‐99‐N2". The Astrophysical Journal. 601 (2): 845–857. arXiv:astro-ph/0310457. Bibcode:2004ApJ...601..845A. doi:10.1086/380820.

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[SIMBAD-1] "MEGA-ML 7". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 June 2018.

[EU-2] "The Extrasolar Planet Encyclopaedia — PA-99-N2 b". exoplanet.eu. Retrieved 2017-07-30.

[3] Ingrosso, G.; Paolis, F. DE; Novati, S. Calchi; Jetzer, PH.; Nucita, A. A.; Zakharov, A. F. (2012). "Detection of Exoplanets in M31 with Pixel-Lensing: The Event Pa-99-N2 Case". The Twelfth Marcel Grossmann Meeting. The Twelfth Marcel Grossmann Meeting: on Recent Developments in Theoretical and Experimental General Relativity. p. 2191. arXiv:1001.2105. Bibcode:2012mgm..conf.2191I. doi:10.1142/9789814374552_0433. ISBN 978-981-4374-51-4.

[4] An, Jin H.; Evans, N. W.; Kerins, E.; Baillon, P.; Calchi Novati, S.; Carr, B. J.; Creze, M.; Giraud‐Heraud, Y.; Gould, A.; Hewett, P.; Jetzer, Ph.; Kaplan, J.; Paulin‐Henriksson, S.; Smartt, S. J.; Tsapras, Y.; Valls‐Gabaud, D. (February 2004). "The Anomaly in the Candidate Microlensing Event PA‐99‐N2". The Astrophysical Journal. 601 (2): 845–857. arXiv:astro-ph/0310457. Bibcode:2004ApJ...601..845A. doi:10.1086/380820.