Exoplanets and SETI

Wright, Jason T.

doi:10.1007/978-3-319-55333-7_186

Cited by 16 publications

(18 citation statements)

References 53 publications

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“…Astronomical events have been suggested for coordinating the timing of transmissions and observations. A number of schemes involve exoplanets, ephemeris and transits (Wright, 2017). One scheme uses exoplanet ephemeris to forecast events such as the conjunction of two exoplanets along a line of sight from the Earth, aiming to intercept a transmission from the far planet towards the planet in between (Siemion et al ., 2014).…”

Section: Other Time Intervalsmentioning

confidence: 99%

Intermittent signals and planetary days in SETI

Gray¹

2020

International Journal of Astrobiology

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Interstellar signals might be intermittent for many reasons, such as targeted sequential transmissions, isotropic broadcasts that are not 'on' continuously or many other reasons. The time interval between such signals would be important, because searchers would need to observe for long enough to achieve an initial detection and possibly determine a period. This article suggests that: (1) the power requirements of interstellar transmissions could be reduced by orders of magnitude by strategies that would result in intermittent signals, (2) planetary rotation might constrain some transmissions to be intermittent and in some cases to have the period of the source planet, and (3) signals constrained by planetary rotation might often have a cadence in the range of 10–25 h, if the majority of planets in our Solar system are taken as a guide. Extended observations might be needed to detect intermittent signals and are rarely used in SETI but are feasible, and seem appropriate when observing large concentrations of stars or following up on good candidate signals.

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Section: Other Time Intervalsmentioning

confidence: 99%

Intermittent signals and planetary days in SETI

Gray¹

2020

International Journal of Astrobiology

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“…The inverse is true for a sender, as mentioned at the end of the previous subsection. Considering the simplicities and merits both for the senders and receivers, this signaling scheme (or similar ones) might be actually prevailing as a tacit adjustment in the strategy space (Schelling 1960;Wright 2018).…”

Section: Receiving Conementioning

confidence: 99%

“…Since the pioneering work by Drake (1961), significant efforts have been made for SETI experiments, but no definite signal has been detected so far (see e.g., Tarter et al 2001;Siemion et al 2013;Harp et al 2016). 1 This might be partly due to the fact that we have explored an extremely small fraction in the multi-dimensional phase space for SETI experiments, under the restrictions of available observational facilities and computational resources (Tarter et al 2010;Wright et al 2018). For example, Tarter et al (2010) figuratively claimed that we have examined only a glass of water randomly sampled from Earth's oceans to find a fish (see also Wright et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Possibility of a Coordinated Signaling Scheme in the Galaxy and SETI Experiments

Seto

2019

ApJ

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We discuss a Galaxy-wide coordinated signaling scheme with which a SETI observer needs to examine a tiny fraction of the sky. The target sky direction is determined as a function of time, based on high-precision measurements of a progenitor of a conspicuous astronomical event such as a coalescence of a double neutron star binary. In various respects, such a coordinated scheme would be advantageous for both transmitters and receivers, and might be widely prevailing as a tacit adjustment. For this scheme, the planned space gravitationalwave detector LISA and its follow-on missions have a potential to narrow down the target sky area by a factor of 10 3-4 , and could have a large impact on future SETI experiments.

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“…Other kinds of signature that can provides measurable evidences of the use of technology (technosignatures), like for example anthropic settlement or radio and luminous signals, are also suggested in order to recognize the presence of intelligent alien civilization. A review of them is given in Wright [76].…”

Section: Surface and Industrial Biosignaturesmentioning

confidence: 99%

Biosignatures Search in Habitable Planets

Claudi

Alei

2019

Galaxies

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The search for life has had a new enthusiastic restart in the last two decades thanks to the large number of new worlds discovered. The about 4100 exoplanets found so far, show a large diversity of planets, from hot giants to rocky planets orbiting small and cold stars. Most of them are very different from those of the Solar System and one of the striking case is that of the super-Earths, rocky planets with masses ranging between 1 and 10 M ⊕ with dimensions up to twice those of Earth. In the right environment, these planets could be the cradle of alien life that could modify the chemical composition of their atmospheres. So, the search for life signatures requires as the first step the knowledge of planet atmospheres, the main objective of future exoplanetary space explorations. Indeed, the quest for the determination of the chemical composition of those planetary atmospheres rises also more general interest than that given by the mere directory of the atmospheric compounds. It opens out to the more general speculation on what such detection might tell us about the presence of life on those planets. As, for now, we have only one example of life in the universe, we are bound to study terrestrial organisms to assess possibilities of life on other planets and guide our search for possible extinct or extant life on other planetary bodies. In this review, we try to answer the three questions that also in this special search, mark the beginning of every research: what? where? how?

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Exoplanets and SETI

Cited by 16 publications

References 53 publications

Intermittent signals and planetary days in SETI

Intermittent signals and planetary days in SETI

Possibility of a Coordinated Signaling Scheme in the Galaxy and SETI Experiments

Biosignatures Search in Habitable Planets

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