The
rogue planet: a short science "crime" story
The
place:
Sheriff Cosmo's office.
The
characters:
cop1 (Sheriff Cosmo); cop2 (Agent
McSpace); cop3 (Agent 'CSI' Stern); the rogue planet
(CFBDSIRJ214947.2-040308.9);
the gang (AB Doradus moving group).
The
background:
a group of concerned
good citizens – a bunch of astronomers from
France and Canada - has reported to the authorities the presence of a
suspicious planet which is roaming alone in the interstellar space
something like 80-160 light years from Earth. The international group
of geeks has snitched
last september when its members
published a research paper
on the journal 'Astronomy&Astrophysics'.
After a long chase, Scheriff Cosmo's men have apprehended the rogue planet, the charge being vagrancy and possession of a false ID card.
The scene: Agent McSpace and Agent 'CSI' Stern are reporting to Sheriff Cosmo.
After a long chase, Scheriff Cosmo's men have apprehended the rogue planet, the charge being vagrancy and possession of a false ID card.
The scene: Agent McSpace and Agent 'CSI' Stern are reporting to Sheriff Cosmo.
The rogue planet (by sciencemug) |
[The picture is adapted from a Public Domain image by sciencemug (source: Wikimedia Commons)]
Agent
McSpace-
... It was wandering as reported, besides the suspect had an ID card
which stated that it is a brown dwarf,
but that's false...
Sheriff Cosmo- If it's not a brown little cosmic body – I think they prefer to be called like this, McRude – what is it our prisoner?
Agent 'CSI' Stern- It is probably a 4−7 Jupiter mass free-floating planet with a temperature of about 700 K and a log g of about 4.0, Sheriff.
SC- Translate for the non-brains, please...
Sheriff Cosmo- If it's not a brown little cosmic body – I think they prefer to be called like this, McRude – what is it our prisoner?
Agent 'CSI' Stern- It is probably a 4−7 Jupiter mass free-floating planet with a temperature of about 700 K and a log g of about 4.0, Sheriff.
SC- Translate for the non-brains, please...
CSI-
Essentially it's not a brown dw... little cosmic body, Sir, but a ball
of gass 4 to 7 times more massive than Jupiter, thus 1300 to 2200
times more massive than the Earth, but anyway 4200 to 7300 times less
massive than the Sun.
SC- Ok, in short a big guy among planets and a loser among stars.
CSI- More or less Sir.
SC- Go on, what about all those strange parameters you mentioned.
CSI- What, the temperature and the log g?
SC- Yeah, that stuff.
CSI- Well, Sir, the surface temperature of the prisoner is about 700 Kelvin...
SC- Hey CSI, I'm a Fahrenheit guy...
CSI- Sorry Sir, it means a bit more than 800 °F.
McS- Ahem...
SC- Yes Agent McSpace?
McS- I'm european on my mother's side, Sir...
SC- So?
McS- Well, Sir, I was born and raised according to the SI system...
SC- Oh for Newton's sake... ok, Stern, convert that Kelvin thing into... what is it McSI?
McS- Celsius Sir, thank you Sir.
Stern looks at McSpace and, with a hint of condescension, says- It's a bit less than 430 °C, McEuropean. This means that our prisoner's surface temperature is 8 times lower than our Sun's one, while it's similar to that of Mercury and about 5 times higher then the Jupiter's one.
SC- What about the log g 4 matter?
CSI- Oh, right Sir. Log g 4 means that the prisoner's surface gravity is about 10 times higher than Earth's gravity, Sir.
SC- Gotcha. Anyway, how come that we made acquaintance with this hobo full of gas?
SC- Ok, in short a big guy among planets and a loser among stars.
CSI- More or less Sir.
SC- Go on, what about all those strange parameters you mentioned.
CSI- What, the temperature and the log g?
SC- Yeah, that stuff.
CSI- Well, Sir, the surface temperature of the prisoner is about 700 Kelvin...
SC- Hey CSI, I'm a Fahrenheit guy...
CSI- Sorry Sir, it means a bit more than 800 °F.
McS- Ahem...
SC- Yes Agent McSpace?
McS- I'm european on my mother's side, Sir...
SC- So?
McS- Well, Sir, I was born and raised according to the SI system...
SC- Oh for Newton's sake... ok, Stern, convert that Kelvin thing into... what is it McSI?
McS- Celsius Sir, thank you Sir.
Stern looks at McSpace and, with a hint of condescension, says- It's a bit less than 430 °C, McEuropean. This means that our prisoner's surface temperature is 8 times lower than our Sun's one, while it's similar to that of Mercury and about 5 times higher then the Jupiter's one.
SC- What about the log g 4 matter?
CSI- Oh, right Sir. Log g 4 means that the prisoner's surface gravity is about 10 times higher than Earth's gravity, Sir.
SC- Gotcha. Anyway, how come that we made acquaintance with this hobo full of gas?
McS-
We were 'introduced' each other by Doc Delorme...
SC-
Who?
McS-
You know him Sir, remember? He's the guy who organized the
surveillance initiative we authorized a while ago, the 'Canada-France
Brown Dwarfs Survey which searches the sky also in the infra-red wavelenght
(CFBDIR)'. He and his pals full of good will contacted us because, during one
of the patrols in their space-block, they spotted a cosmic body
that was floating alone.
SC-
Aah right, right... So our prisoner was, is that body. I see... Well,
nothing like a fistful of zealous
astronomers to keep our asses informed about the sky, don't you
think?
McSpace
and Stern smile while nodding.
SC-
Anything else gentlemen?
McS-
Yes Sir. The prisoner could be affiliated with a gang, the 'AB
Doradus moving group'.
CSI-
Actually there's an 87% probability of such an affiliation, Sir –
points
out Stern pretending not to notice McSpace's eye-rolling.
McS-
The gang is formed by about thirty co-moving stars. Its leader's a
physco, it's been diagnosed with a personality disorder, it's infact
a trinary star* (1)...
Full name's 'AB Doranus' but everybody calls it 'AB Dor'. It and its
other fellas have been spotted for the first time in 2004.
SC-
By who, still nosy civilians?
McS-
Yes Sir, three space-voyeurs from USA and Australia... They gave us
the information in exchange of a one-year free supply
of
donuts, a pile of autographed
pictures of Stephen Hawking
and a paper
published on 'The Astrophysical Journal'**.
SC-
Uhm, fair deal, I'd say... Ok then, these gangsta-moving stars, where
do they usually hang out?
CSI-
Many of the AB Dor's group members can be found in the northern
hemisphere. They are about 15-20 parsec (48-65 light years) away from
us, Sir, partially surrounding
our Sun (1-2).
SC-
Do you think they can become a problem?
McS-
No Sir, they're just some random 50-120 million years old youngsters
(1). Basically it's
only a small flock of star-kids who waste their time loitering around
together in the universe.
SC-
And our prisoner, how old is it?
CSI-
Well, its ID card says it's 20-200 million years old. Anyway it must
be 50-120 million years old too, since it's most probably one of the
AB Dor's affiliates and they accept only people of their age.
Sheriff Cosmo stops swinging on his chair and stands up- Alright gentlemen, take the spectral fingerprints of this spherical cosmic little fart, take its mugshot too and file it as 'CFBDSIRJ214947.2-040308.9'. Once the paper work's done, kick the tramp out of here with a warning, there's no point in keeping it in at the expense of the state.
Sheriff Cosmo stops swinging on his chair and stands up- Alright gentlemen, take the spectral fingerprints of this spherical cosmic little fart, take its mugshot too and file it as 'CFBDSIRJ214947.2-040308.9'. Once the paper work's done, kick the tramp out of here with a warning, there's no point in keeping it in at the expense of the state.
McS-
Yes Sir.
CSI-
Well Sir, it would be important for us to collect as much information
as possible about our guest. We could use it as a benchmark for
understanding the physics of the similar [..] type of exoplanets.
SC- Go on CSI.
SC- Go on CSI.
CSI-
Astronomers are planning and building a new generation of instruments to
look for exoplanets and the universe seems to be plentiful of
isolated planetary mass objects (IPMOs) like our prisoner. We know
now that IPMOs can be the result of stellar formation processes
and/or planets ejection from their host star, moreover young IPMOs
of a few Jupiter masses -again, like our prisoner- would be
interesting analogues of the exoplanets these instruments***
will be build up to detect.
SC-
In other words the more we know about the prisoner, the better chance
we have to fine tune our state-of-the-art tools, the easier hunting exoplanets is going to be.
CSI-
Right, Sir.
McS-
I
respectfully disagree by your enthusiasm.
Hunting is a cruel activity...
At this point Sherif Cosmo and Stern slowly turn toward McSpace, they curl their eybrows as if to say 'Did you really just said that, McDumbass?!' and then, just as slowly, they start talking again.
At this point Sherif Cosmo and Stern slowly turn toward McSpace, they curl their eybrows as if to say 'Did you really just said that, McDumbass?!' and then, just as slowly, they start talking again.
SC-
Ok Stern, you have till sunset, then we let it go back to the sky.
CSI- Yes sheriff, thank you Sir.
CSI- Yes sheriff, thank you Sir.
SC-
Now go, both of you, I have a meeting with the Mayor in 5
minutes, we have to discuss about the organization of the incoming
Carnival Parade. This year the theme is: "The bonobos meet the
spread while the honeybooboos introduce themselves to the fiscal
cliff".
THE
END
Note
The
underlined sentences are quotations from the paper
by Delorme et al.
* I.e. a triple star system, that consists of three stars orbiting each other and that are bound by gravitational attraction.
** Of
course only the story about the donuts is true...
THE PAPER THIS STORY IS BASED ON
- Delorme, P., Gagné, J., Malo, L., Reylé, C., Artigau,E., Albert, L., Forveille, T., Delfosse, X., Allard, F., and D. Homeier (2012). CFBDSIR2149-0403: a 4–7 Jupiter-mass free-floating planet in the young moving group AB Doradus? Astronomy & Astrophysics 548. (PDF version here)
BIBLIOGRAPHY
1- Ortega, V. G., Jilinski, E., De La Reza,R., and Bazzanella, B. (2007). On the common origin of the AB Doradus moving group and the Pleiades cluster. Monthly Notices of the Royal Astronomical Society 377, 441-445.
2- Zuckerman, B., Song I., and Bessell, M.S. (2004). The AB Doradus Moving Group. The Astrophysical Journal Letters 613.
No comments:
Post a Comment
Thanks for your comment dear reader!