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Could Solar Radiation Pressure Explain ‘Oumuamua’s Peculiar Acceleration?

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‘Oumuamua (1I/2017 U1) is the primary object of interstellar origin noticed within the Photo voltaic system.

Just lately, Micheli et al. (2018) reported that ‘Oumuamua confirmed deviations from a Keplerian orbit at a excessive statistical significance.

The noticed trajectory is greatest defined by an extra radial acceleration Δa∝r−2, the place r is the gap of ‘Oumuamua from the Solar. Such an acceleration is of course anticipated for comets, pushed by the evaporating materials. Nevertheless, latest observational and theoretical research suggest that ‘Oumuamua shouldn’t be an energetic comet. We discover the likelihood that the surplus acceleration outcomes from Photo voltaic radiation strain. The required mass-to-area ratio is m/A≈zero.1 g cm−2.

For a skinny sheet, this requires a width of w≈zero.three−zero.9 mm. We discover that though extraordinarily skinny, such an object would survive an interstellar journey over Galactic distances of ∼5 kpc , withstanding collisions with fuel and dust-grains in addition to stresses from rotation and tidal forces. We focus on the doable origins of such an object together with the likelihood that it could be a lightsail of synthetic origin. Our normal outcomes apply to any gentle probes designed for interstellar journey.

Shmuel Bialy, Abraham Loeb
(Submitted on 26 Oct 2018 (v1), final revised 30 Oct 2018 (this model, v2))

Feedback: 5 Pages, 1 Determine. Submitted to ApJL. Minor feedback urged by the referee had been carried out
Topics: Earth and Planetary Astrophysics (astro-ph.EP); Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:1810.11490 [astro-ph.EP] (or arXiv:1810.11490v2 [astro-ph.EP] for this model)
Submission historical past
From: Shmuel Bialy
[v1] Fri, 26 Oct 2018 18:33:15 UTC (107 KB)
[v2] Tue, 30 Oct 2018 22:54:48 UTC (108 KB)

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