Science

discussion

"Inverse transit" candidates

Started by pauldrye
Default_user
almost 8 years ago

As per Meg's request on the blog, here's some "inverse transits" that look like they might be the gravitational lensing they're looking for:

http://www.planethunters.org/sources/SPH10055805 in Q1

Default_user
almost 8 years ago

And another one, which we discussed in some detail awhile back:

http://www.planethunters.org/sources/SPH10116819

Actually, mining that conversation I see that Kianjin came up with a couple of others:

http://www.planethunters.org/sources/SPH10125745

http://www.planethunters.org/sources/SPH10114184

HeadAroundU also pointed this one, whose Q1 and Q2.1 have something but that looks "just glitchy" to me based on Q2.2 (looking at the Kepler grid, I believe this was the sensor that went belly up?)

http://www.planethunters.org/sources/SPH10014539

Default_user
almost 8 years ago

http://www.planethunters.org/sources/SPH10030359 Q1

Default_user
almost 8 years ago

http://www.planethunters.org/sources/SPH10038639 right at the very beginning of Q1

Default_user
almost 8 years ago

Hmm, those look quite "bright" though. Think i saw one earlier which fits the bill of what Meg was asking for, didn't think to mark it though and now i can't find it :(

Default_user
almost 8 years ago

Good idea!

It might be of interest to look at those stars that kianjin has labled with cataclysmic (maybe not just him)

http://talk.planethunters.org/search?for=objects&search=keywords%3A+cataclysmic

This could be of interest: APH10124094

Also, this one has been talked about before (I think) APH23069260.

edit: Another one SPH10125723 (are these too bright?) They could be cataclysmic binaries?

Default_user
almost 8 years ago
arralen in response to pauldrye

pauldrye:

http://www.planethunters.org/sources/SPH10055805 in Q1

... is that possibly a "ordinary" transit on day 106.25 (Q2.3)?

Default_user
almost 8 years ago

wow your fast! definitely thing that sorta look like what I'm talking about - nice finds! - a few of these though have durations of days - those can't be due to microlensing - the transits are on orders of a few hours maybe ~13 at 1 AU - so also check the duration if it's on the several day time scale it's not one of these - keep looking maybe we'll find one

~Meg

Default_user
almost 8 years ago

This one looked promising SPH10116819 but it doesn't repeat in Q2 but it's apparently an eclipsing binary so hmm... but the fact you don't see in it Q2 .... thanks for looking and reporting these

Default_user
almost 8 years ago

Ah, thanks Meg! I was looking for "diagnostic signs" that would let me rule out various "upward transits", but I'd missed that one.

The case I've been focusing on most is how to distinguish star flares from a lensing transit -- not least because I would think they're the most common upward tick by far.

So far I've come up with:

  • Flares are asymmetrical. They rise more quickly than they drop, which shows up as more points on the right side of a spike than the left.

  • Flares are pointy at the top, just a single data point more often than not. A lens-spike would be flat on top.

  • If there's more than one flare, they're almost always of different height. A repeating lens-spike would presumably always have the same height.

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