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We present observational constraints for the initial-to-final mass relation(IFMR) derived from 11 white dwarfs (WDs) in wide binaries (WBs) that contain aturnoff/subgiant primary. Because the components of WBs are coeval to a goodapproximation, the age of the WD progenitor can be determined from the study ofits wide companion. However, previous works that used WBs to constrain the IFMRsuffered from large uncertainties in the initial masses because their MSprimaries are difficult to age-date with good precision. Our selection of WBswith slightly evolved primaries avoids this problem by restricting to a regionof parameter space where isochrone ages are significantly easier to determinewith precision. The WDs of two of our originally selected binaries were foundto be close double degenerates, and are not used in the IFMR analysis. Weobtained more precise constraints than existing ones in the mass range 1-2M$_{\odot}$, corresponding to a previously poorly constrained region of theIFMR. Having introduced the use of turnoff/subgiant-WD binaries, the study ofthe IFMR is not limited anymore by the precision in initial mass, but now thepressure is on final mass, i.e., the mass of the WD today. Looking at the fulldataset, our results would suggest a relatively large dispersion in the IFMR atlow initial masses. More precise determinations of the mass of the WDcomponents of our targets are necessary for settling this question.

Improved Constraints on the Initial-to-Final Mass Relation of White Dwarfs using Wide Binaries