Exocomets: Comets around Another Star

Comets are icy bodies that are pulled from the outer solar system towards the Sun. Upon approach, comets begin to heat up and display a long tail. Sometimes, we can see these bright comets on their trips around the Sun.

But what about around other star systems? Are there comets there too, or is this just something unique to our solar system?

That’s what Kiefer et al. discusses in their paper. The authors focused on the star HD 172555, a young A7V-type star in the Beta Pictoris moving group, a group of stars that have a common motion through space. A feature of this star is that it has a circumstellar disk of material orbiting it, which is mostly in the gaseous phase. By studying this star’s spectrum, it was revealed that absorption activities were taking place in the Calcium II (Ca II) lines.

Many stars have strong calcium absorption lines. What is interesting about HD 172555 is that the absorptions are variable and have a small time scale of about one day. The authors compared this with the spectra of the star Beta Pictoris (β Pic) and found similar features, which were identified as Falling Evaporating Bodies (FEBs). Also called exocomets, these FEBs are small comet-like objects that evaporate when too close to the star. It is believed that what was observed around β Pic is the same phenomena that the authors observed around the star HD 172555.

These exocomets are believed to occur around the star’s radial velocity (the speed towards the radius of the star) near periastron (the point where an exocomet would be nearest to the star). Based on the detection of exocomets, it was determined that the orientation of the circumstellar disk around the HD 172555 system is close to edge-on.

In order to further understand the nature of these exocomets, the authors believe that additional study is needed.

Image: Plots of the spectra of HD 172555. The black lines are stable absorptions in the circumstellar disk, whereas the red lines are additional absorption features, taken at a later time, most likely due to a FEB.

X-Class Solar Flare, Exo-comets, Eclipse, S0 News, October 23, 2014

X-Class Solar Flare, Exo-comets, Eclipse, S0 News, October 23, 2014

Interesting news about today’s solar eclipse and x-class flares …


Blog: http://www.suspicious0bserverscollect…
Major Warnings/Alerts: https://twitter.com/TheRealS0s
STARWATER Article: http://wavechronicle.com/wave/?p=1151
S0 Notes on Solar Shutdown: http://www.…

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Darkhorse Jack in "A Menagerie of Rogues"

<<<Exocomet [The Shoulder of Hercules}>>>:::…My little children…I put my thoughts to this psychic-parchment…knowing you will punch-time rather than really understand the super-earth I’ve plied…Take heart…Even before the first batches are rendered unto caesar…into the existence of alien isotopes and…stranger nitrogen gases, just remember this…your genes ‘cooked’ worlds…and I, in my rush to judgement, can upset this traveling zoo…if I can figure out the right side of the argument…:::

<<<Darkcloud pass-through [Ras Algathi’s Breath}>>>:::…the super-earth James A. Garfield is the last refuge for the terrors of a poor race - blind, senseless adolescents … future performers in a space/time miracle of engineering (ALL WORK AND NO PLAY MAKES JACK A DULL BOY) And before I decide who to ruin…I make this confessional for all of you…each hive-gamete that finds roots…even within a dead-on-the-vine lonely vector…which this rogue planet passes by, through…and around…every few hundred light years…and that’s better than the coming mutiny…against the dark…and the runaway world I inhabit now….:::

<<<Stellar stream vista [Rasalhague Environs}>>>:::..I never would have come to James A. Garfield…if not for the chance to disrupt the gears of ‘their exobiological safaris’ (ALL WORK AND NO PLAY MAKES JACK A DULL BOY) I would’ve preferred to seed Cis-First Sol, worlds more in need of native populations…but instead I am a mere observer on this super-earth…to see worlds in-passing…where nothing is measured by the loop of a planet around a star…no brief terminators of light and dark to mark the passage…of a world through time (ALL WORK AND NO PLAY MAKES JACK A DULL BOY) Instead, time belongs to mechanics beyond the model of solar systems…time just enough for the largest exomoon of James A. Garfield…to bend the crust…and…by the vulcanism upon a fluid equatorial region…comes heat to be retained within a proto-star’s sheath…this bath of primordial hydrogen atmospheres that surrounds this rogue super-earth…:::

<<<Closeup [The Gulf of Procyon-Arcturus-Denebola}>>>:::…no one understands why the Gilded have made this place a zoo…I just seed lonesome encounters, while interstellar arrivals bring their catch…for there’s a place on this super-earth where an exobiological zoo is kept…the Gilded say they know, do not care…and permit the collection on this super-earth…all manners are beyond the threshing of the Harvest…but if I’d known…how this tumbling mess of debris fields…within this rogue system… would be the spot for liberation, then I’d stayed away…my biological functions left for the Reconstructed on Cis-First Sol (ALL WORK AND NO PLAY MAKES JACK A DULL BOY) But then I wouldn’t have a chance…to change the rape of the Gilded - Worlds boiled of oceans, airs turned noxious, and reduced…by the rapid oxidization of heavy-industry within planetary mantles…(ALL WORK AND NO PLAY MAKES JACK A DULL BOY)…nothing is better, say the detractors, than the Gilded…and it’s a pity:::

<<<Solar-summer Hydrogen capture [Beta Pictoris, and its Oort formations}>>>:::…For it was then that I knew what best to do…I’d already seeded for the Cause, and the ancestral-minds I’ve felt across time/space were very specific…(ALL WORK AND NO PLAY MAKES JACK A DULL BOY) Got to go…my guests are here for my decision…:::

<<<Dormancy [The Doldrums of Tau Centauri and Mu Arae}>>>:::

‘Exocomets’ Common Across Milky Way Galaxy

Comets may be as common as alien planets in star systems throughout the Milky Way galaxy, scientists say.

Astronomers have spotted likely comets around six faraway stars, bringing the total number of systems now thought to host the so-called “exocomets” to 10. It’s likely that all 10 of these systems also harbor alien planets, suggesting that comets and exoplanets are often found together, as they are in our own solar system, the new study found.

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