Relevant bibliographies by topics / Proxima Centauri b

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Academic literature on the topic 'Proxima Centauri b'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Proxima Centauri b"

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Ritchie, Raymond J., Anthony W. D. Larkum, and Ignasi Ribas. "Could photosynthesis function on Proxima Centauri b?" International Journal of Astrobiology 17, no. 2 (July 18, 2017): 147–76. http://dx.doi.org/10.1017/s1473550417000167.

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AbstractCould oxygenic and/or anoxygenic photosynthesis exist on planet Proxima Centauri b? Proxima Centauri (spectral type – M5.5 V, 3050 K) is a red dwarf, whereas the Sun is type G2 V (5780 K). The light regimes on Earth and Proxima Centauri b are compared with estimates of the planet's suitability for Chlorophylla(Chla) and Chld-based oxygenic photosynthesis and for bacteriochlorophyll (BChl)-based anoxygenic photosynthesis. Proxima Centauri b has low irradiance in the oxygenic photosynthesis range (400–749 nm: 64–132 µmol quanta m−2s−1). Much larger amounts of light would be available for BChl-based anoxygenic photosynthesis (350–1100 nm: 724–1538 µmol quanta m−2s−1). We estimated primary production under these light regimes. We used the oxygenic algaeSynechocystisPCC6803,Prochlorothrix hollandica,Acaryochloris marina,Chlorella vulgaris,Rhodomonassp. andPhaeodactylum tricornutumand the anoxygenic photosynthetic bacteriaRhodopseudomonas palustris(BChla),Afifella marina(BChla),Thermochromatium tepidum(BChla),Chlorobaculum tepidum(BChla + c) andBlastochloris viridis(BChlb) as representative photosynthetic organisms. Proxima Centauri b has only ≈3% of the PAR (400–700 nm) of Earth irradiance, but we found that potential gross photosynthesis (Pg) on Proxima Centauri b could be surprisingly high (oxygenic photosynthesis: earth ≈0.8 gC m−2h−1; Proxima Centauri b ≈0.14 gC m−2h−1). The proportion of PAR irradiance useable by oxygenic photosynthetic organisms (the sum of Blue + Red irradiance) is similar for the Earth and Proxima Centauri b. The oxygenic photic zone would be only ≈10 m deep in water compared with ≈200 m on Earth. ThePgof an anoxic Earth (gC m−2h−1) is ≈0.34–0.59 (land) and could be as high as ≈0.29–0.44 on Proxima Centauri b. 1 m of water does not affect oxygenic or anoxygenic photosynthesis on Earth, but on Proxima Centauri b oxygenicPgis reduced by ≈50%. Effective elimination of near IR limitsPgby photosynthetic bacteria (<10% of the surface value). The spectrum of Proxima Centauri b is unfavourable for anoxygenic aquatic photosynthesis. Nevertheless, a substantial aerobic or anaerobic ecology is possible on Proxima Centauri b. Protocols to recognize the biogenic signature of anoxygenic photosynthesis are needed.
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Jenkins, James S., Joseph Harrington, Ryan C. Challener, Nicolás T. Kurtovic, Ricardo Ramirez, Jose Peña, Kathleen J. McIntyre, et al. "Proxima Centauri b is not a transiting exoplanet." Monthly Notices of the Royal Astronomical Society 487, no. 1 (May 11, 2019): 268–74. http://dx.doi.org/10.1093/mnras/stz1268.

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Abstract We report Spitzer Space Telescope observations during predicted transits of the exoplanet Proxima Centauri b. As the nearest terrestrial habitable-zone planet we will ever discover, any potential transit of Proxima b would place strong constraints on its radius, bulk density, and atmosphere. Subsequent transmission spectroscopy and secondary-eclipse measurements could then probe the atmospheric chemistry, physical processes, and orbit, including a search for biosignatures. However, our photometric results rule out planetary transits at the 200 ppm level at 4.5 $\mu$m, yielding a 3σ upper radius limit of 0.4 R⊕ (Earth radii). Previous claims of possible transits from optical ground- and space-based photometry were likely correlated noise in the data from Proxima Centauri’s frequent flaring. Our study indicates dramatically reduced stellar activity at near-to-mid infrared wavelengths, compared to the optical. Proxima b is an ideal target for space-based infrared telescopes, if their instruments can be configured to handle Proxima’s brightness.
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Sadovski, A. M., A. B. Struminsky, and A. Belov. "Cosmic Rays near Proxima Centauri b." Astronomy Letters 44, no. 5 (May 2018): 324–30. http://dx.doi.org/10.1134/s1063773718040072.

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Ribas, Ignasi, Emeline Bolmont, Franck Selsis, Ansgar Reiners, Jérémy Leconte, Sean N. Raymond, Scott G. Engle, et al. "The habitability of Proxima Centauri b." Astronomy & Astrophysics 596 (December 2016): A111. http://dx.doi.org/10.1051/0004-6361/201629576.

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Turbet, Martin, Jérémy Leconte, Franck Selsis, Emeline Bolmont, François Forget, Ignasi Ribas, Sean N. Raymond, and Guillem Anglada-Escudé. "The habitability of Proxima Centauri b." Astronomy & Astrophysics 596 (December 2016): A112. http://dx.doi.org/10.1051/0004-6361/201629577.

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Zuluaga, Jorge I., and Sebastian Bustamante. "Magnetic properties of Proxima Centauri b analogues." Planetary and Space Science 152 (March 2018): 55–67. http://dx.doi.org/10.1016/j.pss.2018.01.006.

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Garraffo, C., J. J. Drake, and O. Cohen. "THE SPACE WEATHER OF PROXIMA CENTAURI b." Astrophysical Journal 833, no. 1 (November 30, 2016): L4. http://dx.doi.org/10.3847/2041-8205/833/1/l4.

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Banik, Indranil, and Pavel Kroupa. "Directly testing gravity with Proxima Centauri." Monthly Notices of the Royal Astronomical Society 487, no. 2 (May 17, 2019): 1653–61. http://dx.doi.org/10.1093/mnras/stz1379.

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ABSTRACT The wide binary orbit of Proxima Centauri around α Centauri A and B differs significantly between Newtonian and Milgromian dynamics (MOND). By combining previous calculations of this effect with mock observations generated using a Monte Carlo procedure, we show that this prediction can be tested using high precision astrometry of Proxima Centauri. This requires ≈10 yr of observations at an individual epoch precision of $0.5 \, \mu\rm as$, within the design specifications of the proposed Theia mission. In general, the required duration should scale as the 2/5 power of the astrometric precision. A long-period planet could produce a MOND-like astrometric signal, but only if it has a particular ratio of mass to separation squared and a sky position close to the line segment connecting Proxima Centauri with α Centauri. Uncertainties in perspective effects should be small enough for this test if the absolute radial velocity of Proxima Centauri can be measured to within ≈10 m s−1, better than the present accuracy of 32 m s−1. We expect the required improvement to become feasible using radial velocity zero-points estimated from larger samples of close binaries, with the Sun providing an anchor. We demonstrate that possible astrometric microlensing of Proxima Centauri is unlikely to affect the results. We also discuss why it should be possible to find sufficiently astrometrically stable reference stars. Adequately, addressing these and other issues would enable a decisive test of gravity in the currently little explored low acceleration regime relevant to the dynamical discrepancies in galactic outskirts.
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Kane, Stephen R., Dawn M. Gelino, and Margaret C. Turnbull. "ON THE ORBITAL INCLINATION OF PROXIMA CENTAURI b." Astronomical Journal 153, no. 2 (January 9, 2017): 52. http://dx.doi.org/10.3847/1538-3881/153/2/52.

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Noack, L., K. G. Kislyakova, C. P. Johnstone, M. Güdel, and L. Fossati. "Interior heating and outgassing of Proxima Centauri b: Identifying critical parameters." Astronomy & Astrophysics 651 (July 2021): A103. http://dx.doi.org/10.1051/0004-6361/202040176.

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Context. Since the discovery of a potentially low-mass exoplanet around our nearest neighbour star Proxima Centauri, several works have investigated the likelihood of a shielding atmosphere and therefore the potential surface habitability of Proxima Cen b. However, outgassing processes are influenced by several different (unknown) factors such as the actual planet mass, mantle and core composition, and different heating mechanisms in the interior. Aims. We aim to identify the critical parameters that influence the mantle and surface evolution of the planet over time, as well as to potentially constrain the time-dependent input of volatiles from mantle into the atmosphere. Methods. To study the coupled star–planet evolution, we analysed the heating produced in the interior of Proxima Cen b due to induction heating, which strongly varies with both depth and latitude. We calculated different rotation evolutionary tracks for Proxima Centauri and investigated the change in its rotation period and magnetic field strength. Unlike the Sun, Proxima Centauri possesses a very strong magnetic field of at least a few hundred Gauss, which was likely even stronger in the past. We applied an interior structure model for varying planet masses (derived from the unknown inclination of observation of the Proxima Centauri system) and iron weight fractions, that is, different core sizes, in the range of observed Fe-Mg variations in the stellar spectrum. We used a mantle convection model to study the thermal evolution and outgassing efficiency of Proxima Cen b. For unknown planetary parameters such as initial conditions, we chose randomly selected values. We took heating in the interior due to variable radioactive heat sources and induction heating into account and compared the heating efficiency to tidal heating. Results. Our results show that induction heating may have been significant in the past, leading to local temperature increases of several hundreds of Kelvin. This early heating leads to an earlier depletion of the interior and volatile outgassing compared to if the planet had not been subject to induction heating. We show that induction heating has an impact comparable to tidal heating when assuming latest estimates on its eccentricity. Furthermore, we find that the planet mass (linked to the planetary orbital inclination) has a first-order influence on the efficiency of outgassing from the interior.
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Dissertations / Theses on the topic "Proxima Centauri b"

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Sparrman, Viktor. "Estimates of Fractional Habitability for Proxima Centauri b using a 3D GCM." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-415703.

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Exoplanet discovery has grown more quickly in recent years. However, the nature of their discovery leaves many unanswered in questions regarding exoplanetary habitability. Proxima Centauri b, an exoplanet which orbits the Sun's closest stellar neighbour, Proxima Centauri, was recently discovered with a subzero equilibrium temperature. Although not considered habitable based on the classical definition of the liquid water range, there may be fractions of Proxima Centauri b which are habitable. A prior study simulated the climate conditions of Proxima Centauri b until equilibrium was reached, using a variety of initial conditions. In this project, various metrics for calculating the fractional habitability of Proxima Centauri b are presented and applied to the results of the prior study's simulations. Colormaps are used to show the ice and temperature distributions that produce the calculated values of fractional habitability. The fractional habitabilities calculated show that while the value is both case and metric dependent, for the vast majority of all cases and metrics the value is nonzero implying that Proxima Centauri b is likely to have habitable regions.
Upptäckandet av exoplaneter har ökat i takt över de senaste åren. Samtidigt, på grund av sättet som de upptäcks finns många obesvarade frågor angående planeternas beboelighet. Proxima Centauri b är en exoplanet som kretsar kring solens närmsta granne, Proxima Centauri. Exoplaneten upptäcktes nyligen med en jämviktstemperatur under $0\degree$C. Trots att exoplaneten inte anses beboelig enligt klassisk definition kan det finnas delar av Proxima Centauri b som är beboeliga. En tidigare studie simulerade klimatförhållandena av Proxima Centarui b till jämvikt nåddes, med varierade begynnelsetillstånd. I detta projekt beräknas andelen av Proxima Centauri b som är beboelig genom flera olika mått för "fractional habitability". Måtten jämförs med den tidigare studien och dess simuleringar. Grafiskt åsikdligörs resultaten via färgkartor över planeten för istjocklek och yttemperatur. De beräknade värdena på Proxima Centauri b's "fractional habitability" påvisar beroende på mått och begynnelsetillstånd. Däremot, för en majoritet av både fall och mått är värdet nollskilt vilket antyder att Proxima Centauri b är delvist beboelig.
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Bixel, Alex, and Dániel Apai. "Probabilistic Constraints on the Mass and Composition of Proxima b." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/623234.

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Recent studies regarding the habitability, observability, and possible orbital evolution of the indirectly detected exoplanet Proxima b have mostly assumed a planet with M similar to 1.3 M-circle plus, a rocky composition, and an Earth-like atmosphere or none at all. In order to assess these assumptions, we use previous studies of the radii, masses, and compositions of super-Earth exoplanets to probabilistically constrain the mass and radius of Proxima. b, assuming an isotropic inclination probability distribution. We find it is similar to 90% likely that the planet's density is consistent with a rocky composition; conversely, it is at least 10% likely that the planet has a significant amount of ice or an H/He envelope. If the planet does have a rocky composition, then we find expectation values and 95% confidence intervals of < M >(rocky) = 1.63(-0.72)(+1.66) M-circle plus for its mass and < R >(rocky) = 1.07(-0.31)(+0.38) R-circle plus for its radius.
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