2025MNRAS.541.3664A

Query : 2025MNRAS.541.3664A

2025MNRAS.541.3664A - Mon. Not. R. Astron. Soc., 541, 3664-3674 (2025/August-3)

Life on the edge: using planetary context to enhance biosignatures and avoid false positives.

ARTHUR R., NICHOLSON A.E. and MAYNE N.J.

Abstract (from CDS):

We use a probability theory framework to discuss the search for biosignatures. This perspective allows us to analyse the potential for different biosignatures to provide convincing evidence of extraterrestrial life and to formalise frameworks for accumulating evidence. Analysing biosignatures as a function of planetary context motivates the introduction of 'peribiosignatures', biosignatures observed where life is unlikely. We argue, based on prior work in Gaia theory, that habitability itself is an example of a peribiosignature. Finally, we discuss the implications of context dependence on observational strategy, suggesting that searching the edges of the habitable zone rather than the middle might be more likely to provide convincing evidence of life.

Abstract Copyright: © The Author(s) 2025. Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): astrobiology

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 K2-18b Pl 11 30 14.5177445592 +07 35 18.255348492           ~ 303 0

Query : 2025MNRAS.541.3664A

Basic data :
K2-18b -- Extra-solar Planet
Other object types: otypes_help 		Pl? (2015ApJ,EPIC), Pl (2016ApJS,K2)
ICRS coord. (ep=J2000) : 		11 30 14.5177445592 +07 35 18.255348492 (Optical) [ 0.0220 0.0200 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		11 27 39.8122332755 +07 51 57.901559261 [ 0.0220 0.0200 90 ]
Gal coord. (ep=J2000) : 		254.6323771401059 +62.5757486784381 [ 0.0220 0.0200 90 ]
Proper motions mas/yr : 		-80.479 -133.007 [0.026 0.023 90] A 2020yCat.1350....0G
Parallaxes (mas): 		26.2469 [0.0266] A 2020yCat.1350....0G
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Hierarchy : number of linked objects
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Identifiers (3) :
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EPIC 201912552.01 EPIC 201912552 b K2-18b

References (303 between 1850 and 2026) (Total 303)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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