Request to set a prior on Tc for a known monotransit planet of unknown period

[accameron]

At present the use of a prior on orbital phase derived from the time of conjunction,Tc,
requires the orbital period to be specified as a parameter of make_prior<Gaussian_from_Tc>

In the case of a known monotransit planet it would be very useful if users could set a prior on the
time of conjunction Tc (say KO_Tcprior) while allowing an uninformative prior on the orbital period, as an
alternative to setting a prior on the mean anomaly at the time of the first observation. For any
individual sample, phi could then be calculated from the current samples of P, Tc, e and omega.

[j-faria]

Hi Andrew!
Indeed, this would be quite useful. I'm thinking of creating a transiting_planet akin to the known_object but which is parameterised directly with Tc instead of the mean anomaly phi. This would then work for mono/duo/multi transits in general.

[accameron]

Hi João That would be great! Let me know if you need a beta-testing volunteer when you get around to implementing it. Cheers Andrew

On 6 Dec 2023, at 10:52, João Faria ***@***.***> wrote: Hi Andrew! Indeed, this would be quite useful. I'm thinking of creating a transiting_planet akin to the known_object but which is parameterised directly with Tc instead of the mean anomaly phi. This would then work for mono/duo/multi transits in general. — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***> [ { ***@***.***": "http://schema.org", ***@***.***": "EmailMessage", "potentialAction": { ***@***.***": "ViewAction", "target": "#80 (comment)", "url": "#80 (comment)", "name": "View Issue" }, "description": "View this Issue on GitHub", "publisher": { ***@***.***": "Organization", "name": "GitHub", "url": "https://github.com" } } ]

% ----------------------------------------------------------------------- % Andrew Collier CAMERON, FRSE % Professor of Astronomy % Centre for Exoplanet Science / SUPA, School of Physics & Astronomy % University of St Andrews, North Haugh ST ANDREWS, Fife, KY16 9SS % Tel: +44-1334-463147 % Fax: +44-1334-463104 % ***@***.*** % http://star-www.st-and.ac.uk/~acc4/ % The University of St Andrews is a charity registered in Scotland : % No SC013532 % ———————————————————————————————————

[karenacollins]

Yes, I could really use the Tc prior capability too for mono/duo transit work.

[j-faria]

Hi @accameron, @karenacollins,
The ability to set a prior for $T_c$ is now implemented in the new version of kima that can be found here. There is also a worked through example in the documentation.

I will close this issue for now, but please let me know if you run into any issues with the new version.

[karenacollins]

Thank you!