Characterization of extrasolar terrestrial planets from diurnal photometric variability [1]

E. B. Ford, S. Seager, E. L. Turner

Research output: Contribution to journalArticle

120 Citations (Scopus)

Abstract

The detection of massive planets orbiting nearby stars has become almost routine1,2, but current techniques are as yet unable to detect terrestrial planets with masses comparable to the Earth's. Future space-based observatories to detect Earth-like planets are being planned. Terrestrial planets orbiting in the habitable zones of stars--where planetary surface conditions are compatible with the presence of liquid water--are of enormous interest because they might have global environments similar to Erath's and even harbour life. The light scattered by such a planet will vary in intensity and colour as the planet rotates; the resulting light curve will contain information about the planet's surface and atmospheric properties. Here we report a model that predicts features that should be discernible in the light curve obtained by low-precision photometry. For extrasolar planets similar to Earth, we expect daily flux variations of up to hundreds of per cent, depending sensitively on ice and cloud cover as well as seasonal variations. This suggests that the meteorological variability, composition of the surface (for example, ocean versus land fraction) and rotation period of an Earth-like planet could be derived from photometric observations. Even signatures of Earth-like plant life could be constrained or possibly, with further study, even uniquely determined.

Original languageEnglish (US)
Pages (from-to)885-887
Number of pages3
JournalNature
Volume412
Issue number6850
DOIs
StatePublished - Aug 30 2001

Fingerprint

Planets
Earth (Planet)
Light
Photometry
Ice Cover
Surface Properties
Oceans and Seas
Color
Water

All Science Journal Classification (ASJC) codes

  • General

Cite this

Ford, E. B. ; Seager, S. ; Turner, E. L. / Characterization of extrasolar terrestrial planets from diurnal photometric variability [1]. In: Nature. 2001 ; Vol. 412, No. 6850. pp. 885-887.
@article{2ca9b4ab01604a35b10c392f062d1e02,
title = "Characterization of extrasolar terrestrial planets from diurnal photometric variability [1]",
abstract = "The detection of massive planets orbiting nearby stars has become almost routine1,2, but current techniques are as yet unable to detect terrestrial planets with masses comparable to the Earth's. Future space-based observatories to detect Earth-like planets are being planned. Terrestrial planets orbiting in the habitable zones of stars--where planetary surface conditions are compatible with the presence of liquid water--are of enormous interest because they might have global environments similar to Erath's and even harbour life. The light scattered by such a planet will vary in intensity and colour as the planet rotates; the resulting light curve will contain information about the planet's surface and atmospheric properties. Here we report a model that predicts features that should be discernible in the light curve obtained by low-precision photometry. For extrasolar planets similar to Earth, we expect daily flux variations of up to hundreds of per cent, depending sensitively on ice and cloud cover as well as seasonal variations. This suggests that the meteorological variability, composition of the surface (for example, ocean versus land fraction) and rotation period of an Earth-like planet could be derived from photometric observations. Even signatures of Earth-like plant life could be constrained or possibly, with further study, even uniquely determined.",
author = "Ford, {E. B.} and S. Seager and Turner, {E. L.}",
year = "2001",
month = "8",
day = "30",
doi = "10.1038/35091009",
language = "English (US)",
volume = "412",
pages = "885--887",
journal = "Nature",
issn = "0028-0836",
publisher = "Nature Publishing Group",
number = "6850",

}

Characterization of extrasolar terrestrial planets from diurnal photometric variability [1]. / Ford, E. B.; Seager, S.; Turner, E. L.

In: Nature, Vol. 412, No. 6850, 30.08.2001, p. 885-887.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Characterization of extrasolar terrestrial planets from diurnal photometric variability [1]

AU - Ford, E. B.

AU - Seager, S.

AU - Turner, E. L.

PY - 2001/8/30

Y1 - 2001/8/30

N2 - The detection of massive planets orbiting nearby stars has become almost routine1,2, but current techniques are as yet unable to detect terrestrial planets with masses comparable to the Earth's. Future space-based observatories to detect Earth-like planets are being planned. Terrestrial planets orbiting in the habitable zones of stars--where planetary surface conditions are compatible with the presence of liquid water--are of enormous interest because they might have global environments similar to Erath's and even harbour life. The light scattered by such a planet will vary in intensity and colour as the planet rotates; the resulting light curve will contain information about the planet's surface and atmospheric properties. Here we report a model that predicts features that should be discernible in the light curve obtained by low-precision photometry. For extrasolar planets similar to Earth, we expect daily flux variations of up to hundreds of per cent, depending sensitively on ice and cloud cover as well as seasonal variations. This suggests that the meteorological variability, composition of the surface (for example, ocean versus land fraction) and rotation period of an Earth-like planet could be derived from photometric observations. Even signatures of Earth-like plant life could be constrained or possibly, with further study, even uniquely determined.

AB - The detection of massive planets orbiting nearby stars has become almost routine1,2, but current techniques are as yet unable to detect terrestrial planets with masses comparable to the Earth's. Future space-based observatories to detect Earth-like planets are being planned. Terrestrial planets orbiting in the habitable zones of stars--where planetary surface conditions are compatible with the presence of liquid water--are of enormous interest because they might have global environments similar to Erath's and even harbour life. The light scattered by such a planet will vary in intensity and colour as the planet rotates; the resulting light curve will contain information about the planet's surface and atmospheric properties. Here we report a model that predicts features that should be discernible in the light curve obtained by low-precision photometry. For extrasolar planets similar to Earth, we expect daily flux variations of up to hundreds of per cent, depending sensitively on ice and cloud cover as well as seasonal variations. This suggests that the meteorological variability, composition of the surface (for example, ocean versus land fraction) and rotation period of an Earth-like planet could be derived from photometric observations. Even signatures of Earth-like plant life could be constrained or possibly, with further study, even uniquely determined.

UR - http://www.scopus.com/inward/record.url?scp=0035974863&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035974863&partnerID=8YFLogxK

U2 - 10.1038/35091009

DO - 10.1038/35091009

M3 - Article

C2 - 11528471

AN - SCOPUS:0035974863

VL - 412

SP - 885

EP - 887

JO - Nature

JF - Nature

SN - 0028-0836

IS - 6850

ER -