Results 61 to 70 of about 2,834 (210)
Near-infrared Accretion Signatures from the Circumbinary Planetary-mass Companion Delorme 1 (AB)b
The Astrophysical Journal Letters, 2022 Accretion signatures from bound brown dwarf and protoplanetary companions provide evidence for ongoing planet formation, and accreting substellar objects have enabled new avenues to study the astrophysical mechanisms controlling the formation and ...
S. K. Betti +10 more
doaj +1 more source
, 2009 Current theories on planetary formation establish that giant planet formation should be contextual to their quick migration towards the central star due to the protoplanets-disc interactions on a timescale of the order of $10^5$ years, for objects of ...
A. Del Popolo +46 more
core +1 more source
Formation of Methanol via Fischer‐Tropsch Catalysis by Cosmic Iron Sulphide
ChemPhysChem, Volume 25, Issue 17, September 2, 2024.Periodic quantum mechanical simulations evidence the potentiality to synthesise methanol through a Fischer‐Tropsch mechanism in different astrophysical environments facilitated by the catalytic properties of cosmic FeS grains, which are enhanced by the presence of naturally‐occurring point surface defects.
Berta Martinez‐Bachs +3 more
wiley +1 more source
The Astrophysical JournalThe discovery of protoplanets and circumplanetary disks provides a unique opportunity to characterize planet formation through observations. Massive protoplanets shape the physical and chemical structure of their host circumstellar disk by accretion ...
Felipe Alarcón, Edwin A. Bergin
doaj +1 more source
Exploration on initial structures of extrasolar protoplanets via new explicit RKAHeM(4,4) method
Egyptian Journal of Remote Sensing and Space Sciences, 2015 In this paper, a newly proposed embedded Runge–Kutta fourth order with four stages arithmetic Heronian mean method is employed and verified in determining the distribution of thermodynamic variables inside the extra-solar protoplanets formed through ...
Gour Chandra Paul, Sukumar SenthilKumar
doaj +1 more source
Systematic Multiepoch Monitoring of LkCa 15: Dynamic Dust Structures on Solar System Scales
The Astrophysical Journal, 2023 We present the highest-angular-resolution infrared monitoring of LkCa 15, a young solar analog hosting a transition disk. This system has been the subject of a number of direct-imaging studies from the millimeter through the optical, which have revealed ...
Steph Sallum +3 more
doaj +1 more source
Metallicity of the Massive Protoplanets Around HR 8799 If Formed by Gravitational Instability
, 2009 The final composition of giant planets formed as a result of gravitational instability in the disk gas depends on their ability to capture solid material (planetesimals) during their 'pre-collapse' stage, when they are extended and cold, and contracting ...
Alexander +35 more
core +1 more source
On the Emergent Spectra of Hot Protoplanet Collision Afterglows [PDF]
, 2008 We explore the appearance of terrestrial planets in formation by studying the emergent spectra of hot molten protoplanets during their collisional formation.
Asplund +25 more
core +1 more source
The Astrophysical Journal Letters2MASS J16120668–3010270 (hereafter 2MJ1612) is a young M0 star that hosts a protoplanetary disk in the Upper Scorpius star-forming region. Recent Atacama Large Millimeter/submillimeter Array (ALMA) observations of 2MJ1612 show a mildly inclined disk ( i
Jialin Li +34 more
doaj +1 more source
The Astrophysical Journal, 2023 The first step toward planet formation is grain growth from (sub)micrometer to millimeter/centimeter sizes. Grain growth has been reported not only in Class II protoplanetary disks but also in Class 0/I protostellar envelopes.
Ilseung Han +4 more
doaj +1 more source