SETI papers

Are we alone ?

technosignature #TS, Dyson Sphere #DS, Breakthrough Listen #BL, Gravitational lensing or lens #GL, Galileo Project #GP, biosignature #BS

[SETI papers @SETIpapers]

The first SETI paper was published by nature in 1959. Cocconi and Morrison assumed that ET civilizations would communicate each other using radio wave.
https://t.co/tlRxyeXRH4

[SETI papers @SETIpapers]

"On the inevitability and the possible structures of supercivilizations"
https://t.co/h4AOCQwARO

Kardashev (1985) proposed six scenarios for supercivilizations, suggesting we search for large solid structures near powerful, compact astronomical objects.

[SETI papers @SETIpapers]

"An Extragalactic Widefield Search for Technosignatures with the Murchison Widefield Array"
https://t.co/HLM3TSmJcD

First low-freq extragalactic search using MWA. Thousands of background galaxies confirmed towards Vela supernova remnant, setting the tightest upper limit on TR.

[SETI papers @SETIpapers]

Due to the two magnitudes lower brightness in the observed signal, the author suggests a rare scenario where the Wow! signal might actually be the first recorded event of an astronomical maser flare.

[SETI papers @SETIpapers]

"Arecibo Wow! I: An Astrophysical Explanation for the Wow! Signal"
https://t.co/huctMTCgVJ

High-resolution (~10kHz) analysis of Arecibo data shows that neutral hydrogen emissions from cold clouds can closely resemble the Wow! signal … (Continue the discussion in the comments)

[SETI papers @SETIpapers]

"Search for Artificial Stellar Sources of Infrared Radiation"
https://t.co/cJzyjG3zoB

The original paper introduced the concept of a Dyson Sphere. Highly advanced ETIs could create an artificial biosphere that completely envelops its host star, radiating in the far infrared.

[SETI papers @SETIpapers]

"The Goldstone Apple Valley Radio Telescope (GAVRT) Search for Extra Terrestrial Intelligence (SETI)"
https://t.co/IQ8i6DkTEY

Middle and high-school students analyzed data from DSS-28, a 34m single dish antenna at 8.45GHz under a science program supervised by JPL. No detections.

[SETI papers @SETIpapers]

"Inferring the Rate of Technosignatures from 60 yr of Nondetection"
https://t.co/jhLuQdLok0

Assuming ETCs exist uniformly and the emission rate (ER) is constant, ER is less than 1-5 per century, and the next event crossing Earth is no less than 60-1800 years at 50% of chance.

[SETI papers @SETIpapers]

"The ultraviolet habitable zone of exoplanets"
https://t.co/7ebjqiAlGD

UV radiation can affect the presence of life in two ways: 1) triggers abiogenesis with a minimum flux and 2) breaks biomolecules with a strong flux. UV-habitable zone (UHZ) defined to study this further.

[SETI papers @SETIpapers]

"Implications of vaporating cooling by H2 for 1I`Oumuamua"
https://t.co/WSd9yIE1kT

Refutation of the H2 jet hypothesis. The H2 evaporation cooling is not negligible; the surface temperature is lower (factor of 9), and the thermal speed of the H2 jet is slower (factor of 3).

[SETI papers @SETIpapers]

"Acceleration of 1I`Oumuamua from radiolytically produced H2 in H2O ice"
https://t.co/uKYUD1PARi

H2 jet from the H2O-rich icy body might have caused the non-gravitational acceleration of 1I`Oumuamua.

[SETI papers @SETIpapers]

"The Search for Extraterrestrial Civilizations: A Scientific, Technical, Political, Social, and Cultural Adventure"
https://t.co/uEzvQi9fZn

The best short (14 pages) summary of SETI with historical background. CETI was renamed SETI at its first international conference in 1971.

[SETI papers @SETIpapers]

"Orbit-to-ground framework to decode and predict biosignature patterns in terrestrial analogues"
https://t.co/Ad5cIK8Psm

Deep learning models have been tested to find terrestrial biosignatures in Salar de Pajonales, Chile, to apply these models to Mars rovers/orbiters images.

[SETI papers @SETIpapers]

"Sensitive Multi-beam Targeted SETI Observations towards 33 Exoplanet Systems with FAST"
https://t.co/WZ6O2lhmB2

A distinctive narrow band signal is detected towards Kepler-438, but from the polarization property, later rejected as an instrumental RFI.

[SETI papers @SETIpapers]

"Earth through the looking glass: how frequently are we detected by other civilizations through photometric microlensing?"
https://t.co/PDnh4zXRIJ

Although the chance is very low, ETC might be able to find the Earth via microlensing through the Galactic distances.

[SETI papers @SETIpapers]

"Could the 'Wow' signal have originated from a stochastic repeating beacon?"
https://t.co/HFKqCY5Cyu

We might have missed detecting the second #WowSignal because it is stochastical and had an insufficient observation. Additional 62 days of observation can reject this hypothesis.

[SETI papers @SETIpapers]

"Searching the SETI Ellipsoid with Gaia"
https://t.co/u4dA1OKBc2

The #SETI_Ellipsoid is a strategy to decide the time & direction of receiving a message from #ETCs triggered by a Galactic event like a super-nova. Currently, ~100 stars are at the ellipsoid surface of SN 1987A.

[SETI papers @SETIpapers]

"Searching for broadband pulsed beacons from 1883 stars using neural networks"
https://t.co/lfTGVRtXy1

#BL proj. surveyed #BPB targeting nearby (~50 pc) stars at 4-8 GHz. No signal detected. The prevalence of #BPB is less than 0.001 (including background stars, up to 1000 pc).

[SETI papers @SETIpapers]

"Avoiding the Great Filter: Predicting the Timeline for Humanity to Reach Kardashev Type I Civilization"
https://t.co/hGajZLiH55

Based on the 3 types of energy usage (fossil fuel, nuclear, renewable) and policies including global warming, it takes ~400 yrs to be KI (optimistic).

[SETI papers @SETIpapers]

"Disruption of a Planetary Nitrogen Cycle as Evidence of Extraterrestrial Agriculture"
https://t.co/MAQjOC4JYy

Agricultural activity can be traced back up to 20,000 years: one of the oldest #TSs. The excess of NH3 & N2O from the use of fertilizer might be a good target. #ExoFarm

[SETI papers @SETIpapers]

"SETI in 2021" https://t.co/XcOBWIVwm7

The second paper of the SETI in 20XX series. It summarizes the recent SETI status and 93 papers/books published last year. Two individuals acquired PhD in SETI. The most competitive #TS candidate discovered:#blc1, and later rejected as RFI.