Folding transit curves

[Laura Watson]

Hello,

Is there a way to fold multiple curves into one in AstroImageJ by setting the period manually? And can AstroImageJ determine which period gives the best folded curve/produce periodograms?

Thanks!
Laura

[karenacollins]

Hi Laura,

You can fold a light curve on a fixed ephemeris, but AIJ does not current solve for the best fit ephemeris or produce periodograms. To fold on a fixed ephemeris, use:
Multi-plot_Main->X-axis->"Set epoch and period..." to set those parameters.

Then select:
Multi-plot_Main->X-axis->"Show X-axis as days since Tc"

Note: there are other X-axis phasing options which work for display, but if you are fitting the transit, you will need to select the "days" since Tc option.

Karen

On 5/9/2018 11:20 AM, Laura Watson [via AstroImageJ] wrote:

Hello,

Is there a way to fold multiple curves into one in AstroImageJ by setting the period manually? And can AstroImageJ determine which period gives the best folded curve/produce periodograms?

Thanks!
Laura

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NAML

[Laura Watson]

Great, thanks Karen! Are there plans to include a feature to solve for period/produce periodograms in the future?

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From: karenacollins [via AstroImageJ] <ml+[hidden email]>
Sent: 09 May 2018 13:27:47
To: Watson, Laura
Subject: Re: Folding transit curves

 

Hi Laura,

You can fold a light curve on a fixed ephemeris, but AIJ does not current solve for the best fit ephemeris or produce periodograms. To fold on a fixed ephemeris, use:
Multi-plot_Main->X-axis->"Set epoch and period..." to set those parameters.

Then select:
Multi-plot_Main->X-axis->"Show X-axis as days since Tc"

Note: there are other X-axis phasing options which work for display, but if you are fitting the transit, you will need to select the "days" since Tc option.

Karen

On 5/9/2018 11:20 AM, Laura Watson [via AstroImageJ] wrote:

Hello,

Is there a way to fold multiple curves into one in AstroImageJ by setting the period manually? And can AstroImageJ determine which period gives the best folded curve/produce periodograms?

Thanks!
Laura

---

If you reply to this email, your message will be added to the discussion below:

http://astroimagej.1065399.n5.nabble.com/Folding-transit-curves-tp1004.html

To start a new topic under AstroImageJ, email [hidden email]
To unsubscribe from AstroImageJ, click here.
NAML

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NAML

[karenacollins]

Hi Laura,

Unfortunately there are no immediate plans to solve for period. Periodograms can probably be produced already using the underlying ImageJ tools and/or available plugings, but I am not well versed enough in that area to point you to any specific resources. Nevertheless, I've added you suggestions to the AIJ requested features list.

Of course VARTOOLS (https://www.astro.princeton.edu/~jhartman/vartools.html) are the standard tools for searches for periodic events in light curves, but the tools can take some time learn to use.

Karen