1SWASP J140747.93-394542.6 - Exoplanet, rings and moons?

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1SWASP J140747.93-394542.6 - Exoplanet, rings and moons?

Post by Sirius_Alpha on 5th August 2014, 4:27 am

It was reported some time ago that in 2007 that a transit of 1SWASP J140747.93-394542.6 seemed to be rather complex, likely explained by the existence of structured rings.

Monitoring of J1407 for next extrasolar ring system transit
http://www.aavso.org/aavso-alert-notice-462

Planetary Construction Zones in Occultation: Discovery of an Extrasolar Ring System Transiting a Young Sun-like Star and Future Prospects for Detecting Eclipses by Circumsecondary and Circumplanetary Disks
http://arxiv.org/abs/1108.4070

A re-analysis of the data is quite interesting:

Analysis and modeling of a giant transiting multiple ring system around the substellar companion J1407b
http://www.ast.cam.ac.uk/talks/archive/3495
In May 2007 the nearby young (17 Myr) pre-MS star J1407 underwent a series of deep complex eclipses that lasted over 60 days. These eclipses were interpreted by Mamajek et al. (2012) to be caused by a giant ring system of up to 60 million km in diameter surrounding an unseen substellar companion, J1407b. A re-analysis of the photometry shows structure down to timescales of 1 hour, consistent with the movement of ring edges across the diameter of the stellar disk. We present our model of this giant exo-Saturn ring system, showing how we can simultaneously solve for the geometry of the ring system and the detection of over 20 individual rings. The presence of highly structured multiple rings is a signpost of the presence of exomoons. Future transits of this ring system will provide a unique observing opportunity to study a young ring system in formation.

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Re: 1SWASP J140747.93-394542.6 - Exoplanet, rings and moons?

Post by Lazarus on 5th August 2014, 4:03 pm

van Werkhoven, Kenworthy and Mamajek (2014) "Analysis of 1SWASP J140747.93-394542.6 eclipse fine-structure: hints of exomoons"

Also available on Eric Mamajek's home page.
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Re: 1SWASP J140747.93-394542.6 - Exoplanet, rings and moons?

Post by Lazarus on 27th October 2014, 4:17 pm

Kenworth et al. "Mass and period limits on the ringed companion transiting the young star J1407"
http://arxiv.org/abs/1410.6577

Further constraints from photometric and radial velocity observations. The central object hosting the ring system is likely to be either a brown dwarf or a planet, and the rings are substantially larger than the Roche radius, suggesting they may go on to form exomoons.
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Re: 1SWASP J140747.93-394542.6 - Exoplanet, rings and moons?

Post by Led_Zep on 27th October 2014, 8:46 pm

Page 20 :

Observations at longer wavelengths may be able to detect
and possibly resolve the ring system around J1407b.
Heating from the secondary companion combined with the
large surface area of the ring system results in significant flux
at submm wavelengths, detectable with the Atacama Large
Millimeter Array (ALMA) or a large single dish submm telescope.
When the full ALMA suite of telescopes is deployed,
a high precision astrometric detection can constrain the orbit
of the secondary companion and measure the mass of the
ring system
()
The ringed system around J1407b represents a unique laboratory to both spatially
and spectrally resolve a young 16 Myr old disk around
a likely substellar object and probe its structure to unprecedented
spatial scales. Photometric monitoring is underway
to look for the beginning of the next eclipse, and will signal
the start of intensive observational campaigns over the
subsequent weeks.
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Re: 1SWASP J140747.93-394542.6 - Exoplanet, rings and moons?

Post by Edasich on 29th October 2014, 11:57 am

Listed in EPE:

http://exoplanet.eu/catalog/1swasp_j1407_b/
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Re: 1SWASP J140747.93-394542.6 - Exoplanet, rings and moons?

Post by Sunchaser on 29th October 2014, 10:09 pm

Any idea as to when we will see the results?

-M-
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Re: 1SWASP J140747.93-394542.6 - Exoplanet, rings and moons?

Post by Sirius_Alpha on 26th January 2015, 8:04 pm

Modeling giant extrasolar ring systems in eclipse and the case of J1407b: sculpting by exomoons?
http://arxiv.org/abs/1501.05652

The light curve of 1SWASP J140747.93-394542.6, a ∼16 Myr old star in the Sco-Cen OB association, underwent a complex series of deep eclipses that lasted 56 days, centered on April 2007. This light curve is interpreted as the transit of a giant ring system that is filling up a fraction of the Hill sphere of an unseen secondary companion, J1407b. We fit the light curve with a model of an azimuthally symmetric ring system, including spatial scales down to the temporal limit set by the star's diameter and relative velocity. The best ring model has 37 rings and extends out to a radius of 0.6 AU (90 million km), and the rings have an estimated total mass on the order of 100MMoon. The ring system has one clearly defined gap at 0.4 AU (61 million km), which we hypothesize is being cleared out by a <0.8M⊕ exosatellite orbiting around J1407b. This eclipse and model implies that we are seeing a circumplanetary disk undergoing a dynamic transition to an exosatellite-sculpted ring structure and is one of the first seen outside our Solar system.

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Re: 1SWASP J140747.93-394542.6 - Exoplanet, rings and moons?

Post by Led_Zep on 27th January 2015, 10:04 am

http://spaceref.com/astronomy/gigantic-ring-system-around-exoplanet-j1407b.html

"...A new analysis of the data, led by Leiden's Matthew Kenworthy, shows that the ring system consists of over 30 rings, each of them tens of millions of kilometers in diameter. Furthermore, they found gaps in the rings, which indicate that satellites ("exomoons") may have formed. The result has been accepted for publication in the Astrophysical Journal...."
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Re: 1SWASP J140747.93-394542.6 - Exoplanet, rings and moons?

Post by Lazarus on 27th January 2015, 3:05 pm

The image of the ring data is worth a look.

Wonder if there will be a similar event at the conjunction of Beta Pic b.
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Re: 1SWASP J140747.93-394542.6 - Exoplanet, rings and moons?

Post by Led_Zep on 28th January 2015, 3:34 pm

http://vimeo.com/117757625

Computer model that fits the light curve of the star J1407 seen in SuperWASP data in 2007
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Re: 1SWASP J140747.93-394542.6 - Exoplanet, rings and moons?

Post by Lazarus on 28th September 2016, 2:00 pm

Rieder & Kenworthy "Constraints on the size and dynamics of the J1407b ring system"
http://arxiv.org/abs/1609.08485

They infer that J1407b is likely a massive brown dwarf or a small star (60100 MJupiter), and the disc is likely in a retrograde orbit with respect to the companion's orbital motion.
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Re: 1SWASP J140747.93-394542.6 - Exoplanet, rings and moons?

Post by Shellface on 28th September 2016, 4:57 pm

This is largely inconsistent with the mass constraints found by Kenworthy et al., which are based on the combined results of various complimentary methods. Note that Kenworthy is a co-author for this paper, however.

While correct for its purpose, I suspect the methodology used here is too greatly simplified to make broad conclusions - in particular only the ~minimum possible period (11 yrs) is considered, which forces the companion mass to be large to maintain a large hill sphere. I would like to see what constraints are possible for periods of a few decades.

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Re: 1SWASP J140747.93-394542.6 - Exoplanet, rings and moons?

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