Destruction of Molecular Hydrogen Ice and Implications for 1I/2017 U1 (‘Oumuamua)

  title={Destruction of Molecular Hydrogen Ice and Implications for 1I/2017 U1 (‘Oumuamua)},
  author={Thiem C. Hoang and Abraham Loeb},
  journal={arXiv: Astrophysics of Galaxies},
The first interstellar object observed in our solar system, 1I/2017 U1 (`Oumuamua), exhibited a number of peculiar properties, including extreme elongation and acceleration excess. Recently, \cite{Seligman:2020vb} proposed that the object was made out of molecular hydrogen (H$_{2}$) ice. The question is whether H$_2$ objects could survive their travel from the birth sites to the solar system. Here we study destruction processes of icy H$_2$ objects through their journey from giant molecular… 

Figures from this paper

Assessing the Formation of Solid Hydrogen Objects in Starless Molecular Cloud Cores
The properties of the first-discovered interstellar object (ISO), 1I/2017 (‘Oumuamua), differ from both solar system asteroids and comets, casting doubt on a protoplanetary disk origin. In this
1I/‘Oumuamua as an N 2 Ice Fragment of an exo‐Pluto Surface: I. Size and Compositional Constraints
The origin of the interstellar object 1I/'Oumuamua has defied explanation. We perform calculations of the non-gravitational acceleration that would be experienced by bodies composed of a range of
Constraints on the Occurrence of ‘Oumuamua-Like Objects
At present, there exists no consensus in the astronomical community regarding either the bulk composition or the formation mechanism for the interstellar object 1I/2017 U1 (‘Oumuamua). With the goal
Evidence Suggesting That ‘Oumuamua Is the ∼30 Myr Old Product of a Molecular Cloud
The appearance of interstellar objects (ISOs) in the solar system—and specifically the arrival of 1I/‘Oumuamua—points to a significant number density of free-floating bodies in the solar
On the Possibility of an Artificial Origin for `Oumuamua
Science offers the privilege of following evidence, not prejudice. The first interstellar object discovered near Earth, `Oumuamua, showed half a dozen anomalies relative to comets or asteroids in the
Preliminary Evidence That Protoplanetary Disks Eject More Mass Than They Retain
If interstellar objects originate in protoplanetary disks, they can be used to calibrate the fraction of mass that such disks eject. The discoveries of interstellar objects 1I/‘Oumuamua and
Anomalous Sun Flyby of 1I/2017 U1 (`Oumuamua)
The findings of Micheli et al. (Nature2018, 559, 223–226) that 1I/2017 U1 (`Oumuamua) showed anomalous orbital accelerations have motivated us to apply an impact model of gravity in search for an
Constraining the orientation of the spin axes of extrasolar minor bodies 1I/2017 U1 (‘Oumuamua) and 2I/Borisov
Context. The orientation of the spin axis of a comet is defined by the values of its equatorial obliquity and its cometocentric longitude of the Sun. These parameters can be computed from the
Observable Signatures of the Ejection Speed of Interstellar Objects from Their Birth Systems
`Oumuamua and Borisov were the first two interstellar objects confirmed in the Solar system. The upcoming commencement of the Vera C. Rubin Observatory's Legacy Survey of Space of Time (LSST) will
Oumuamuas Passing through Molecular Clouds
The detections of 1I/Oumuamua and 2I/Borisov within just two years demonstrate impressively that interstellar objects (ISOs) must be common in the Milky Way. Once released from their parent system,


Non-gravitational acceleration in the trajectory of 1I/2017 U1 (‘Oumuamua)
‘Oumuamua—the first known interstellar object to have entered the Solar System—is probably a comet, albeit with unusual dust and chemical properties owing to its origin in a distant solar system.
Can Baryonic Dark Matter BE Solid Hydrogen
Some requirements are discussed for solid hydrogen formation in cold dark dense clouds in galaxies. If temperatures in the clouds are near the microwave background temperature of 2.7 K and molecular
A case against baryons in galactic halos
Physics of the Interstellar and Intergalactic Medium
This is a comprehensive and richly illustrated textbook on the astrophysics of the interstellar and intergalactic medium--the gas and dust, as well as the electromagnetic radiation, cosmic rays, and
H2 in interstellar and extragalactic ices: infrared characteristics, ultraviolet production, and implications.
The condensation-sublimation and infrared spectral properties of ices containing H2 are presented and it is shown that solid H2 in H20-rich ices can be detected by an infrared absorption band at 4137 cm-1 (2.417 micrometers).
Evidence that 1I/2017 U1 (‘Oumuamua) was Composed of Molecular Hydrogen Ice
`Oumuamua (I1 2017) was the first macroscopic ($l\sim100\,{\rm m}$) body observed to traverse the inner solar system on an unbound hyperbolic orbit. Its light curve displayed strong periodic
Tidal fragmentation as the origin of 1I/2017 U1 (‘Oumuamua)
The first discovered interstellar object (ISO), ‘Oumuamua (1I/2017 U1) shows a dry and rocky surface, an unusually elongated shape, with short-to-long axis ratio c ∕ a  ≲ 1∕6, a low velocity relative
  • 2019
Collisional elongation: Possible origin of extremely elongated shape of 1I/‘Oumuamua
Light curve observations of a recently discovered interstellar object 1I/`Oumuamua suggest that this object has an extremely elongated shape with the axis ratio 0.3 or smaller. Planetesimal
Could 1I/’Oumuamua be an Icy Fractal Aggregate?
1I/'Oumuamua was the first interstellar interloper that has been detected and it showed a non-gravitational acceleration (Micheli et al. 2018) that cannot be accounted for by outgassing, given the