Gliese 436 c

A nice paper of Dr. Ballard has been accepted and for publication and should appear on astro-ph on Tue 7 Sep.

Wow! Finally. And where information? There will be a press conference by NASA?

This is super earth like 2 years ago??where did you get this information any link?? where i can read about it??

Says so on the EPOXI facebook page.

Thank you for your answers. That means you, too, Stalker was born in Siberia. I'm from Kemerovo.

In general the last few weeks are very rich in exoplanets. And the October - November, hope will publish many discoveries of Kepler.

Er, wow... so much for "super".

Hmm very interesting I am curious about mass this planet and distance from star.

"unter-Earth"

I think this is the same candidate.

http://arxiv.org/abs/0909.2875

Quote :

4.1. Best Candidate Transit Signal
We find no transit signals for GJ 436c at the significance limit set by
2=250. We present
our best candidate here, which corresponds to a planet with radius 1.04 R and period 8.42 days.
The improvement in the 2 over the null hypothesis is 170. We investigate the possibility of signal
suppression by masking these suspected transit points from the points used to create the 2D spline,
and recreating the spline surface. We find that the candidate transit depth is unaltered, indicating
that these points are well-sampled on the CCD. In Figure 8, we show the phased and binned best
candidate signal, as well as the two observed candidate transit events separately. The gap in the
middle of the first event is due to the star wandering off the bottom edge of the CCD for a period
of about an hour.

In general, a period of about 9 days.

The most interesting question - it was to measure the mass? After the January observations Spitzer has been more than 6 months. It is a pity that in the Keck Observatory publish logs of observations, only with a lag of 18 months.
https://koa.ipac.caltech.edu/available_date.html

If transit timing variations can be positively detected, the mass can be measured through that.

It is interesting that there were repeated observations of this star Spitzer.

http://ssc.spitzer.caltech.edu/warmmission/scheduling/observinglogs/plan/alltogether.txt

Quote :

GJ436b-ecl-c 11:42:11.00 26:42:23.00 Harringt JH-ESP-T 60003 iracmapp 357.41 2010-06-23 17:42:27.0 38807296 GJ436b-ecl-ch1-1
GJ436b-ecl-c 11:42:16.85 26:42: 4.90 Harringt JH-ESP-T 60003 iracmapp 4.03 2010-06-23 23:36:32.7 38806016 GJ436b-ecl-ch1-1-co

Could be for additional, high-accuracy TTV measurements.

In general, if you take these three observation windows GJ436:

1) 2010-01-28 06:54:44.0 - 2010-01-29 00:45:01.2

2) 2010-06-23 17:42:27.0 - 2010-06-23 23:36:32.7

3) 2010-06-29 00:55:18.3 - 2010-06-29 06:49:21.3

In the period of 8.42 days get 1 and 3 windows. Second windows out of calculations.

Please recheck.

In addition to the 1 and 3 window Spitzer observed for 2 channel (4.5 micron), in 2 window - 1 channel (3.6 microns).

I think you're right. The first and third windows are ~18 orbital periods apart.

Uhm 0.75 Earth radii would quite beat both CoRoT and Kepler.

Whan they state "Earth-like", I think they refer to composition rather orbital location. Anyway let's wait for Sep 7.

If indeed it has a period of 8.42 d, the planet will get about 9 times the insolation that Earth does. Clearly too hot to be habitable.

It is obvious habitable zone around gj 436 star is from 0.12 AU(high albedo) to 0.3AU(low albedo,dense atmosphere).Planet c Will be very hot.

As I understand it, the liquid water habitable zone around red dwarfs occurs for lower insolation values than for solar type stars because Rayleigh scattering is less efficient for longer wavelengths, plus there are various absorption features in the spectra of various atmospheric constituents. This results in a decrease in the albedo of the planet.

Lazarus wrote:

As I understand it, the liquid water habitable zone around red dwarfs occurs for lower insolation values than for solar type stars because Rayleigh scattering is less efficient for longer wavelengths, plus there are various absorption features in the spectra of various atmospheric constituents. This results in a decrease in the albedo of the planet.

Interesting point. But likely we may deal with a planet within equivalent orbital separation of Mercury.
Maybe something more like a "more-extreme-Venus"...a Phosphorian planet as in Dollan's ArcBuilder
Fantasy gets concrete

So, what should already be at least 5 observed transits - two EPOXI in the visible band, a Spitzer at 8 micron, and the two Spitzer observation at 4.5 microns.

You know... it could be that the paper will say something like this.

"After using Spitzer 4.5 and 8 µm photometry during the predicted transit times of the planet, we rule out additional transiting planets with radii > 0.75 R_E with 3σ confidence. Furthermore, we find no evidence of transit timing variations for Gliese 436 b."

It is possible of course. This may explain why no press conference, NASA, and the only article in the Archiv.org.