Results 41 to 50 of about 21,946 (214)

The Astrobiology of Alien Worlds: Known and Unknown Forms of Life

Universe, 2020
Most definitions of life assume that, at a minimum, life is a physical form of matter distinct from its environment at a lower state of entropy than its surroundings, using energy from the environment for internal maintenance and activity, and capable of
Louis N. Irwin, Dirk Schulze-Makuch
doaj   +1 more source

Optimization applied to selected exoplanets [PDF]

Journal of Astrophysics and Astronomy, 2021
Transit and radial velocity models were applied to archival data in order to examine exoplanet properties, in particular for the recently discovered super-Earth GJ 357b. There is however considerable variation in estimated model parameters across the literature, and especially their uncertainty estimates.
Shi Yuan Ng, Zhou Jiadi, Çağlar Püsküllü, Timothy Banks, Edwin Budding, Michael D. Rhodes   +5 more
openaire   +4 more sources

Exoplanets as Sub-GeV Dark Matter Detectors [PDF]

, 2021
We present exoplanets as new targets to discover dark matter (DM). Throughout the Milky Way, DM can scatter, become captured, deposit annihilation energy, and increase the heat flow within exoplanets.
Leane, Rebecca K, Smirnov, Juri, Juri Smirnov, Rebecca K. Leane   +3 more
core   +1 more source

Biological, Equilibrium and Photochemical Signatures of C, N and S Isotopes in the Early Earth and Exoplanet Atmospheres

Life
The unambiguous detection of biosignatures in exoplanet atmospheres is a primary objective for astrobiologists and exoplanet astronomers. The primary methodology is the observation of combinations of gases considered unlikely to coexist in an atmosphere ...
James R. Lyons
doaj   +1 more source

The Habitability of the Galactic Bulge

Life, 2020
We present a new investigation of the habitability of the Milky Way bulge, that expands previous studies on the Galactic Habitable Zone. We discuss existing knowledge on the abundance of planets in the bulge, metallicity and the possible frequency of ...
Amedeo Balbi, Maryam Hami, Andjelka Kovačević   +2 more
doaj   +1 more source

Is there an exoplanet in the Solar system? [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2016
Abstract We investigate the prospects for the capture of the proposed Planet 9 from other stars in the Sun's birth cluster. Any capture scenario must satisfy three conditions: the encounter must be more distant than ∼150 au to avoid perturbing the Kuiper belt; the other star must have a wide-orbit planet (a ≳ 100 au); the planet must be ...
Mustill, Alexander J.,, Raymond, Sean N., Davies, Melvyn B.,   +2 more
openaire   +3 more sources

Three sub-Jupiter-mass planets: WASP-69b & WASP-84b transit active K dwarfs and WASP-70Ab transits the evolved primary of a G4+K3 binary [PDF]

, 2014
peer reviewedWe report the discovery of the transiting exoplanets WASP-69b, WASP-70Ab and WASP-84b, each of which orbits a bright star (V ˜ 10). WASP-69b is a bloated Saturn-mass planet (0.26 MJup, 1.06 RJup) in a 3.868-d period around an active, ˜1-Gyr,
Fumel, A., Gómez Maqueo Chew, Y., Taylor, J., Southworth, J., Pollacco, Don, West, Richard G., West, R.G., Pepe, F., Skillen, I., West, R. G., Ségransan, D., Udry, S., Delrez, L., Maxted, P. F. L., Turner, O.D., Smith, A. M. S., Delrez, Laetitia, Faedi, Francesca, Gillon, Michaël, Chew, Y. Gomez Maqueo, Maxted, P.F.L., Jehin, E., Doyle, A.P., Queloz, D., Pollacco, D., Doyle, A. P., Gillon, M., Hellier, C., Faedi, F., Cameron, A. Collier, Turner, O. D., Anderson, D.R., Triaud, A. H. M. J., Triaud, A.H.M.J., Jehin, Emmanuel, Smalley, B., Triaud, A. H. M. J.; id_orcid, Collier Cameron, A., Lendl, M., Smith, A.M.S., Anderson, D. R., Cameron, A. Collier; id_orcid   +41 more
core   +1 more source

Performance study of interferometric small-sats to detect exoplanets: updated exoplanet yield and application to nearby exoplanets [PDF]

, 2020
Nulling interferometry is considered as one of the most promising solutions to spectrally characterize rocky exoplanets in the habitable zone of nearby stars. It provides both high angular resolution and starlight mitigation.
Dandumont, Colin, Loicq, Jerôme, Defrere, Denis, Kammerer, Jens   +3 more
core   +1 more source

Habitable exoplanet - a statistical search for life

Frontiers in Astronomy and Space Sciences
IntroductionThe identification of habitable exoplanets is an important challenge in modern space science, requiring the combination of planetary and stellar parameters to assess conditions that support life.MethodsUsing a dataset of 5867 exoplanets from ...
Prasenjit Banerjee, Asis Kumar Chattopadhyay   +1 more
doaj   +1 more source

Catalog of nearby exoplanets

, 2006
We present a catalog of nearby exoplanets. It contains the 172 known low-mass companions with orbits established through radial velocity and transit measurements around stars within 200 pc.
Fischer, D. A., Tinney, C. G., Johnson, J. A., McCarthy, C., Marcy, G. W., Butler, R. P., Penny, A. J., Vogt, S. S., Jones, H. R. A., Wright, J. T., Carter, B. D.   +10 more
core   +1 more source